chore: git cache cleanup
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docs/implementation/DOCKER_OPTIMIZATION_PHASE_2_3_COMPLETE.md
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docs/implementation/DOCKER_OPTIMIZATION_PHASE_2_3_COMPLETE.md
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# Docker CI/CD Optimization: Phase 2-3 Implementation Complete
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**Date:** February 4, 2026
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**Phase:** 2-3 (Integration Workflow Migration)
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**Status:** ✅ Complete - Ready for Testing
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---
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## Executive Summary
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Successfully migrated 4 integration test workflows to use the registry image from `docker-build.yml` instead of building their own images. This eliminates **~40 minutes of redundant build time per PR**.
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### Workflows Migrated
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1. ✅ `.github/workflows/crowdsec-integration.yml`
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2. ✅ `.github/workflows/cerberus-integration.yml`
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3. ✅ `.github/workflows/waf-integration.yml`
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4. ✅ `.github/workflows/rate-limit-integration.yml`
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---
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## Implementation Details
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### Changes Applied (Per Section 4.2 of Spec)
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#### 1. **Trigger Mechanism** ✅
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- **Added:** `workflow_run` trigger waiting for "Docker Build, Publish & Test"
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- **Added:** Explicit branch filters: `[main, development, 'feature/**']`
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- **Added:** `workflow_dispatch` for manual testing with optional tag input
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- **Removed:** Direct `push` and `pull_request` triggers
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**Before:**
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```yaml
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on:
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push:
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branches: [ main, development, 'feature/**' ]
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pull_request:
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branches: [ main, development ]
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```
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**After:**
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```yaml
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on:
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workflow_run:
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workflows: ["Docker Build, Publish & Test"]
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types: [completed]
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branches: [main, development, 'feature/**']
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workflow_dispatch:
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inputs:
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image_tag:
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description: 'Docker image tag to test'
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required: false
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```
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#### 2. **Conditional Execution** ✅
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- **Added:** Job-level conditional: only run if docker-build.yml succeeded
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- **Added:** Support for manual dispatch override
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```yaml
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if: ${{ github.event.workflow_run.conclusion == 'success' || github.event_name == 'workflow_dispatch' }}
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```
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#### 3. **Concurrency Controls** ✅
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- **Added:** Concurrency groups using branch + SHA
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- **Added:** `cancel-in-progress: true` to prevent race conditions
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- **Handles:** PR updates mid-test (old runs auto-canceled)
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```yaml
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concurrency:
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group: ${{ github.workflow }}-${{ github.event.workflow_run.head_branch || github.ref }}-${{ github.event.workflow_run.head_sha || github.sha }}
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cancel-in-progress: true
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```
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#### 4. **Image Tag Determination** ✅
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- **Uses:** Native `github.event.workflow_run.pull_requests` array (NO API calls)
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- **Handles:** PR events → `pr-{number}-{sha}`
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- **Handles:** Branch push events → `{sanitized-branch}-{sha}`
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- **Applies:** Tag sanitization (lowercase, replace `/` with `-`, remove special chars)
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- **Validates:** PR number extraction with comprehensive error handling
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**PR Tag Example:**
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```
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PR #123 with commit abc1234 → pr-123-abc1234
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```
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**Branch Tag Example:**
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```
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feature/Add_New-Feature with commit def5678 → feature-add-new-feature-def5678
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```
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#### 5. **Registry Pull with Retry** ✅
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- **Uses:** `nick-fields/retry@v3` action
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- **Configuration:**
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- Timeout: 5 minutes
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- Max attempts: 3
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- Retry wait: 10 seconds
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- **Pulls from:** `ghcr.io/wikid82/charon:{tag}`
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- **Tags as:** `charon:local` for test scripts
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```yaml
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- name: Pull Docker image from registry
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id: pull_image
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uses: nick-fields/retry@v3
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with:
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timeout_minutes: 5
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max_attempts: 3
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retry_wait_seconds: 10
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command: |
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IMAGE_NAME="ghcr.io/${{ github.repository_owner }}/charon:${{ steps.image.outputs.tag }}"
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docker pull "$IMAGE_NAME"
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docker tag "$IMAGE_NAME" charon:local
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```
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#### 6. **Dual-Source Fallback Strategy** ✅
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- **Primary:** Registry pull (fast, network-optimized)
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- **Fallback:** Artifact download (if registry fails)
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- **Handles:** Both PR and branch artifacts
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- **Logs:** Which source was used for troubleshooting
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**Fallback Logic:**
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```yaml
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- name: Fallback to artifact download
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if: steps.pull_image.outcome == 'failure'
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run: |
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# Determine artifact name (pr-image-{N} or push-image)
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gh run download ${{ github.event.workflow_run.id }} --name "$ARTIFACT_NAME"
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docker load < /tmp/docker-image/charon-image.tar
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docker tag $(docker images --format "{{.Repository}}:{{.Tag}}" | head -1) charon:local
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```
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#### 7. **Image Freshness Validation** ✅
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- **Checks:** Image label SHA matches expected commit SHA
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- **Warns:** If mismatch detected (stale image)
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- **Logs:** Both expected and actual SHA for debugging
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```yaml
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- name: Validate image SHA
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run: |
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LABEL_SHA=$(docker inspect charon:local --format '{{index .Config.Labels "org.opencontainers.image.revision"}}' | cut -c1-7)
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if [[ "$LABEL_SHA" != "$SHA" ]]; then
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echo "⚠️ WARNING: Image SHA mismatch!"
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fi
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```
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#### 8. **Build Steps Removed** ✅
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- **Removed:** `docker/setup-buildx-action` step
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- **Removed:** `docker build` command (~10 minutes per workflow)
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- **Kept:** All test execution logic unchanged
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- **Result:** ~40 minutes saved per PR (4 workflows × 10 min each)
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---
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## Testing Checklist
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Before merging to main, verify:
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### Manual Testing
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- [ ] **PR from feature branch:**
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- Open test PR with trivial change
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- Wait for docker-build.yml to complete
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- Verify all 4 integration workflows trigger
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- Confirm image tag format: `pr-{N}-{sha}`
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- Check workflows use registry image (no build step)
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- [ ] **Push to development branch:**
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- Push to development branch
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- Wait for docker-build.yml to complete
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- Verify integration workflows trigger
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- Confirm image tag format: `development-{sha}`
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- [ ] **Manual dispatch:**
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- Trigger each workflow manually via Actions UI
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- Test with explicit tag (e.g., `latest`)
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- Test without tag (defaults to `latest`)
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- [ ] **Concurrency cancellation:**
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- Open PR with commit A
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- Wait for workflows to start
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- Force-push commit B to same PR
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- Verify old workflows are canceled
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- [ ] **Artifact fallback:**
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- Simulate registry failure (incorrect tag)
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- Verify workflows fall back to artifact download
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- Confirm tests still pass
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### Automated Validation
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- [ ] **Build time reduction:**
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- Compare PR build times before/after
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- Expected: ~40 minutes saved (4 × 10 min builds eliminated)
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- Verify in GitHub Actions logs
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- [ ] **Image SHA validation:**
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- Check workflow logs for "Image SHA matches expected commit"
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- Verify no stale images used
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- [ ] **Registry usage:**
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- Confirm no `docker build` commands in logs
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- Verify `docker pull ghcr.io/wikid82/charon:*` instead
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---
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## Rollback Plan
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If issues are detected:
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### Partial Rollback (Single Workflow)
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```bash
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# Restore specific workflow from git history
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git checkout HEAD~1 -- .github/workflows/crowdsec-integration.yml
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git commit -m "Rollback: crowdsec-integration to pre-migration state"
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git push
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```
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### Full Rollback (All Workflows)
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```bash
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# Create rollback branch
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git checkout -b rollback/integration-workflows
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# Revert migration commit
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git revert HEAD --no-edit
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# Push to main
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git push origin rollback/integration-workflows:main
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```
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**Time to rollback:** ~5 minutes per workflow
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---
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## Expected Benefits
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### Build Time Reduction
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| Metric | Before | After | Improvement |
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|--------|--------|-------|-------------|
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| Builds per PR | 5x (1 main + 4 integration) | 1x (main only) | **5x reduction** |
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| Build time per workflow | ~10 min | 0 min (pull only) | **100% saved** |
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| Total redundant time | ~40 min | 0 min | **40 min saved** |
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| CI resource usage | 5x parallel builds | 1 build + 4 pulls | **80% reduction** |
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### Consistency Improvements
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- ✅ All tests use **identical image** (no "works on my build" issues)
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- ✅ Tests always use **latest successful build** (no stale code)
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- ✅ Race conditions prevented via **immutable tags with SHA**
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- ✅ Build failures isolated to **docker-build.yml** (easier debugging)
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---
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## Next Steps
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### Immediate (Phase 3 Complete)
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1. ✅ Merge this implementation to feature branch
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2. 🔄 Test with real PRs (see Testing Checklist)
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3. 🔄 Monitor for 1 week on development branch
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4. 🔄 Merge to main after validation
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### Phase 4 (Week 6)
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- Migrate `e2e-tests.yml` workflow
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- Remove build job from E2E workflow
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- Apply same pattern (workflow_run + registry pull)
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### Phase 5 (Week 7)
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- Enhance `container-prune.yml` for PR image cleanup
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- Add retention policies (24h for PR images)
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- Implement "in-use" detection
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---
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## Metrics to Monitor
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Track these metrics post-deployment:
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| Metric | Target | How to Measure |
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|--------|--------|----------------|
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| Average PR build time | <20 min (vs 62 min before) | GitHub Actions insights |
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| Image pull success rate | >95% | Workflow logs |
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| Artifact fallback rate | <5% | Grep logs for "falling back" |
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| Test failure rate | <5% (no regression) | GitHub Actions insights |
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| Workflow trigger accuracy | 100% (no missed triggers) | Manual verification |
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---
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## Documentation Updates Required
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- [ ] Update `CONTRIBUTING.md` with new workflow behavior
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- [ ] Update `docs/ci-cd.md` with architecture diagrams
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- [ ] Create troubleshooting guide for integration tests
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- [ ] Update PR template with CI/CD expectations
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---
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## Known Limitations
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1. **Requires docker-build.yml to succeed first**
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- Integration tests won't run if build fails
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- This is intentional (fail fast)
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2. **Manual dispatch requires knowing image tag**
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- Use `latest` for quick testing
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- Use `pr-{N}-{sha}` for specific PR testing
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3. **Registry must be accessible**
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- If GHCR is down, workflows fall back to artifacts
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- Artifact fallback adds ~30 seconds
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---
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## Success Criteria Met
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✅ **All 4 workflows migrated** (`crowdsec`, `cerberus`, `waf`, `rate-limit`)
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✅ **No redundant builds** (verified by removing build steps)
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✅ **workflow_run trigger** with explicit branch filters
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✅ **Conditional execution** (only if docker-build.yml succeeds)
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✅ **Image tag determination** using native context (no API calls)
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✅ **Tag sanitization** for feature branches
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✅ **Retry logic** for registry pulls (3 attempts)
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✅ **Dual-source strategy** (registry + artifact fallback)
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✅ **Concurrency controls** (race condition prevention)
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✅ **Image SHA validation** (freshness check)
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✅ **Comprehensive error handling** (clear error messages)
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✅ **All test logic preserved** (only image sourcing changed)
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---
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## Questions & Support
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- **Spec Reference:** `docs/plans/current_spec.md` (Section 4.2)
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- **Implementation:** Section 4.2 requirements fully met
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- **Testing:** See "Testing Checklist" above
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- **Issues:** Check Docker build logs first, then integration workflow logs
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---
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## Approval
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**Ready for Phase 4 (E2E Migration):** ✅ Yes, after 1 week validation period
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**Estimated Time Savings per PR:** 40 minutes
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**Estimated Resource Savings:** 80% reduction in parallel build compute
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