[IMP] Push PR test image to make easier test changes

Author: josep-tecnativa

.github/workflows/ci.yml

@@ -40,6 +40,10 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}
+      - name: Install system deps for duplicity build
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y librsync-dev
       - name: Generate cache key CACHE
         run:
           echo "CACHE=${{ secrets.CACHE_DATE }} ${{ runner.os }} $(python -VV |
@@ -59,6 +63,10 @@ jobs:
       # Run tests
       - run: poetry run pytest --prebuild
   build-push:
+    permissions:
+      contents: read
+      packages: write
+      pull-requests: write
     runs-on: ubuntu-24.04
     services:
       registry:
@@ -98,11 +106,68 @@ jobs:
       - name: Compute image name
         id: image_name_compute
         run: |
+          owner="${GITHUB_REPOSITORY_OWNER,,}"
+          repo="${GITHUB_REPOSITORY#*/}"
           if [ "${{ matrix.target }}" = "base" ]; then
-            echo "::set-output name=image_name::${{ env.DOCKER_IMAGE_NAME }}"
+            echo "image_name=${owner}/${repo}" >> "$GITHUB_OUTPUT"
           else
-            echo "::set-output name=image_name::${{ env.DOCKER_IMAGE_NAME }}-${{ matrix.target }}"
+            echo "image_name=${owner}/${repo}-${{ matrix.target }}" >> "$GITHUB_OUTPUT"
           fi
+      - name: Docker meta for PR test image
+        if: ${{ github.event_name == 'pull_request' }}
+        id: docker_meta_pr
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ steps.image_name_compute.outputs.image_name }}
+          tags: |
+            type=raw,value=test-pr${{ github.event.number }}
+
+      - name: Login to GHCR for PR (same-repo only)
+        if:
+          ${{ github.event_name == 'pull_request' &&
+          github.event.pull_request.head.repo.full_name == github.repository }}
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ secrets.BOT_LOGIN }}
+          password: ${{ secrets.BOT_TOKEN }}
+
+      - name: Build & push PR test image (GHCR)
+        if:
+          ${{ github.event_name == 'pull_request' &&
+          github.event.pull_request.head.repo.full_name == github.repository }}
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: |
+            linux/amd64
+            linux/arm64/v8
+          target: ${{ matrix.target }}
+          push: true
+          load: false
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache,mode=max
+          labels: ${{ steps.docker_meta_pr.outputs.labels }}
+          tags: ${{ steps.docker_meta_pr.outputs.tags }}
+
+      - name: Comment PR with test image tag (optional)
+        if:
+          ${{ github.event_name == 'pull_request' &&
+          github.event.pull_request.head.repo.full_name == github.repository }}
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const img = 'ghcr.io/${{ steps.image_name_compute.outputs.image_name }}';
+            const tag = 'test-pr${{ github.event.number }}';
+            const target = '${{ matrix.target }}';
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body: `Test image for **${target}**:\n\`${img}:${tag}\``
+            });
+
       - name: Docker meta for local images
         id: docker_meta_local
         uses: docker/metadata-action@v5