updated github actions

.github/workflows/docker-build-pr.yml

@@ -0,0 +1,56 @@
+name: Build Docker Images (PR)
+
+on:
+  pull_request:
+    branches:
+      - main
+      - develop
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+
+    strategy:
+      matrix:
+        include:
+          - service: web
+            dockerfile: docker/web/Dockerfile
+            context: .
+          - service: caddy
+            dockerfile: docker/caddy/Dockerfile
+            context: .
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-${{ matrix.service }}
+          tags: |
+            type=ref,event=pr
+
+      - name: Build Docker image (no push)
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: ${{ matrix.context }}
+          file: ${{ matrix.dockerfile }}
+          push: false
+          load: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max