CI: Add Renovate automation and Caddy v3 monitor; fix CADDY_IMAGE ARG scope

.github/renovate.json

@@ -0,0 +1,71 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    ":semanticCommits",
+    ":separateMultipleMajorReleases",
+    "helpers:pinGitHubActionDigests"
+  ],
+  "baseBranches": ["development"],
+  "timezone": "UTC",
+  "dependencyDashboard": true,
+  "prConcurrentLimit": 10,
+  "prHourlyLimit": 5,
+  "labels": ["dependencies"],
+  "rebaseWhen": "conflicted",
+  "vulnerabilityAlerts": { "enabled": true },
+  "schedule": ["every weekday"],
+  "rangeStrategy": "bump",
+  "packageRules": [
+    {
+      "description": "Automerge safe patch updates",
+      "matchUpdateTypes": ["patch"],
+      "automerge": true
+    },
+    {
+      "description": "Frontend npm: automerge minor for devDependencies",
+      "matchManagers": ["npm"],
+      "matchDepTypes": ["devDependencies"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "automerge": true,
+      "labels": ["dependencies", "npm"]
+    },
+    {
+      "description": "Backend Go modules",
+      "matchManagers": ["gomod"],
+      "labels": ["dependencies", "go"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "automerge": false
+    },
+    {
+      "description": "GitHub Actions updates",
+      "matchManagers": ["github-actions"],
+      "labels": ["dependencies", "github-actions"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "automerge": true
+    },
+    {
+      "description": "Docker: keep Caddy within v2 (no automatic jump to v3)",
+      "matchManagers": ["dockerfile"],
+      "matchPackageNames": ["caddy"],
+      "allowedVersions": "<3.0.0",
+      "labels": ["dependencies", "docker"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "automerge": true
+    },
+    {
+      "description": "Group non-breaking npm minor/patch",
+      "matchManagers": ["npm"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "npm minor/patch",
+      "prPriority": -1
+    },
+    {
+      "description": "Group docker base minor/patch",
+      "matchManagers": ["dockerfile"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "docker base updates",
+      "prPriority": -1
+    }
+  ]
+}

.github/workflows/caddy-major-monitor.yml

@@ -0,0 +1,62 @@
+name: Monitor Caddy Major Release
+
+on:
+  schedule:
+    - cron: '17 7 * * 1' # Mondays at 07:17 UTC
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+  issues: write
+
+jobs:
+  check-caddy-major:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check for Caddy v3 and open issue
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const upstream = { owner: 'caddyserver', repo: 'caddy' };
+            const { data: releases } = await github.rest.repos.listReleases({
+              ...upstream,
+              per_page: 50,
+            });
+            const latestV3 = releases.find(r => /^v3\./.test(r.tag_name));
+            if (!latestV3) {
+              core.info('No Caddy v3 release detected.');
+              return;
+            }
+
+            const issueTitle = `Track upgrade to Caddy v3 (${latestV3.tag_name})`;
+
+            const { data: existing } = await github.rest.issues.listForRepo({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'open',
+              per_page: 100,
+            });
+
+            if (existing.some(i => i.title === issueTitle)) {
+              core.info('Issue already exists — nothing to do.');
+              return;
+            }
+
+            const body = [
+              'Caddy v3 has been released upstream and detected by the scheduled monitor.',
+              '',
+              `Detected release: ${latestV3.tag_name} (${latestV3.html_url})`,
+              '',
+              '- Create a feature branch to evaluate the v3 migration.',
+              '- Review breaking changes and update Docker base images/workflows.',
+              '- Validate Trivy scans and update any policies as needed.',
+              '',
+              'Current policy: remain on latest 2.x until v3 is validated.'
+            ].join('\n');
+
+            await github.rest.issues.create({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              title: issueTitle,
+              body,
+            });

.github/workflows/renovate.yml

@@ -0,0 +1,23 @@
+name: Renovate
+
+on:
+  schedule:
+    - cron: '0 5 * * *' # daily 05:00 EST
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+  issues: write
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run Renovate
+        uses: renovatebot/github-action@v40.1.11
+        with:
+          configurationFile: .github/renovate.json
+          token: ${{ secrets.GITHUB_TOKEN }}
+        env:
+          LOG_LEVEL: info

Dockerfile

@@ -6,6 +6,9 @@ ARG VERSION=dev
 ARG BUILD_DATE
 ARG VCS_REF
 
+# Allow pinning Caddy base image by digest via build-arg
+ARG CADDY_IMAGE=caddy:2-alpine
+
 # ---- Frontend Builder ----
 # Build the frontend using the BUILDPLATFORM to avoid arm64 musl Rollup native issues
 FROM --platform=$BUILDPLATFORM node:20-alpine AS frontend-builder
@@ -52,8 +55,6 @@ RUN CGO_ENABLED=1 GOOS=linux go build \
     -o api ./cmd/api
 
 # ---- Final Runtime with Caddy ----
-# Allow pinning Caddy by digest via build-arg
-ARG CADDY_IMAGE=caddy:2-alpine
 FROM ${CADDY_IMAGE}
 WORKDIR /app