Publish verified Docker images to GHCR

Make deployments pull immutable CI-built images while keeping test failures diagnosable before any package is published.

.github/workflows/ci.yml

@@ -4,6 +4,7 @@ on:
   pull_request:
   push:
     branches: [main]
+    tags: ["v*"]
 
 permissions:
   contents: read
@@ -41,7 +42,49 @@ jobs:
         run: docker compose -f compose.yaml config --quiet
       - name: Test
         run: ./gradlew --no-daemon clean test
+      - name: Upload test reports
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-reports-${{ github.run_id }}
+          path: |
+            build/reports/tests/test
+            build/test-results/test
+          if-no-files-found: ignore
       - name: Build deployable JAR
         run: ./gradlew --no-daemon buildFatJar
       - name: Build container
         run: docker build -t osg-account-server:ci .
+
+  publish:
+    if: github.event_name == 'push'
+    needs: verify
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/metadata-action@v5
+        id: metadata
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/osg-account-server
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=sha,prefix=sha-
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max