feat: push docker image on push to main

.github/workflows/build-and-test-backend.yml

@@ -2,10 +2,11 @@ name: Gradle Build
 
 on:
   push:
+    branches:
+      - feature/**
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
     permissions:
       contents: read

.github/workflows/cr-main.yml

@@ -7,7 +7,7 @@ on:
       - feature/vhvapm-547
 
 env:
-  REGISTRY_IMAGE: inspectit/inspectit-gepard-agent
+  REGISTRY_IMAGE: inspectit/inspectit-gepard-configserver
 
 jobs:
   build-jar:
@@ -33,5 +33,109 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-artifact@v3
         with:
-          name: agent-artifact
-          path: backend/build/libs/backend-0.0.1-SNAPSHOT.jar
+          name: configserver-artifact
+          path: backend/build/libs/backend-0.0.1-SNAPSHOT.jar
+  build-image:
+    runs-on: ubuntu-latest
+    needs: build-agent
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm/v6
+          - linux/arm/v7
+          - linux/arm64
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV          
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+
+      - name: Download artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: configserver-artifact
+          path: ./  # Download artifact to the root of the Docker build context
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: "./backend/Dockerfile-CR"
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"          
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    runs-on: ubuntu-latest
+    needs:
+      - build-image
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)          
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}

backend/Dockerfile-CR

@@ -0,0 +1,11 @@
+# ---- Runtime Stage ----
+# We use Temurin as it is the default at VHV
+FROM eclipse-temurin:21-jre-jammy
+
+COPY ./inspectit-gepard-agent.jar ./app.jar
+
+# Expose the port on which the app will run
+EXPOSE 8080
+
+# Run the application
+ENTRYPOINT ["java", "-jar", "/app.jar"]