feat(backend): backend arm builds, create dockerfile

.github/workflows/backend.yml

@@ -3,6 +3,16 @@ name: backend
 on:
   push:
   workflow_dispatch:
+    inputs:
+      build_arm:
+        type: boolean
+        description: "Build for ARM as well"
+        default: false
+        required: false
+
+env:
+  DOCKER_IMAGE_NAME: ghcr.io/loculus-project/backend
+  BUILD_ARM: ${{ github.ref == 'refs/heads/main' || github.event.inputs.build_arm }}
 
 concurrency:
   group: ci-${{ github.ref == 'refs/heads/main' && github.run_id || github.ref }}-backend
@@ -26,7 +36,7 @@ jobs:
         id: files-hash
         run: |
           DIR_HASH=$(echo -n ${{ hashFiles('backend/**', '.github/workflows/backend.yml') }})
-          echo "DIR_HASH=$DIR_HASH" >> $GITHUB_ENV
+          echo "DIR_HASH=$DIR_HASH${{ env.BUILD_ARM && '-arm'|| '' }}" >> $GITHUB_ENV
 
       - name: Setup Docker metadata
         id: dockerMetadata
@@ -52,6 +62,9 @@ jobs:
           EXISTS=$(docker manifest inspect ${{ env.DOCKER_IMAGE_NAME }}:${{ env.DIR_HASH }} > /dev/null 2>&1 && echo "true" || echo "false")
           echo "CACHE_HIT=$EXISTS" >> $GITHUB_ENV
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Set up JDK
         if: env.CACHE_HIT == 'false'
         uses: actions/setup-java@v4
@@ -63,22 +76,24 @@ jobs:
         if: env.CACHE_HIT == 'false'
         uses: gradle/actions/setup-gradle@v3
 
-      - name: Build Docker Image For Branch
+      - name: Build Backend
         if: env.CACHE_HIT == 'false'
-        run: ./gradlew bootBuildImage --imageName=${{ env.DOCKER_IMAGE_NAME }}:${{ env.DIR_HASH }}
         working-directory: ./backend
-        env:
-          USER: ${{ github.actor }}
-          TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        run: ./gradlew bootJar
 
-      - name: Push Docker Image
+      - name: Build and push image if input files changed
         if: env.CACHE_HIT == 'false'
-        run: docker push ${{ env.DOCKER_IMAGE_NAME }}:${{ env.DIR_HASH }}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/build-push-action@v5
+        with:
+          context: ./backend
+          push: true
+          tags: ${{ steps.dockerMetadata.outputs.tags }}
+          cache-from: type=gha,scope=backend-${{ github.ref }}
+          cache-to: type=gha,mode=max,scope=backend-${{ github.ref }}
+          platforms: ${{ env.BUILD_ARM && 'linux/amd64,linux/arm64' || 'linux/amd64' }}
 
-      - name: Tag and push existing images
+      - name: Retag and push existing image if cache hit
+        if: env.CACHE_HIT == 'true'
         run: |
           TAGS=(${{ steps.dockerMetadata.outputs.tags }})
           for TAG in "${TAGS[@]}"; do

backend/Dockerfile

@@ -0,0 +1,9 @@
+FROM eclipse-temurin:21-jre-alpine
+
+WORKDIR /app
+
+COPY build/libs/backend.jar app.jar
+
+EXPOSE 8079
+
+ENTRYPOINT ["java", "-jar", "app.jar", "--spring.profiles.active=docker"]

backend/build.gradle

@@ -79,3 +79,11 @@ tasks.named('bootBuildImage') {
     // https://paketo.io/docs/howto/configuration/
     environment["BPE_SPRING_PROFILES_ACTIVE"] = "docker"
 }
+
+tasks.named("jar") {
+    enabled = false // prevent to generate plain jar
+}
+tasks.named("bootJar") {
+    enabled = true
+    archiveVersion.set("")
+}