Add workflow for pushing image to Github Packages

.github/workflows/docker-image.yml → .github/workflows/build-docker-image.yml

@@ -1,4 +1,4 @@
-name: Docker Image CI
+name: Build Docker Image
 
 on:
   push:

.github/workflows/push-docker-image.yml

@@ -0,0 +1,61 @@
+name: Push Docker Image
+
+on:
+  push:
+    branches: [ "micronaut" ]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: maven
+    - uses: s4u/maven-settings-action@64e42c454dbd42ef6370ac8539685755aedd205b
+      with:
+        servers: |
+          [{
+            "id": "github-playground-micronaut",
+            "username": "epsilonlabs",
+            "password": "${{ secrets.GH_TOKEN_READ_MICRONAUT }}"
+          }]
+    - name: Download the backend JAR
+      run: mvn -B dependency:copy-dependencies -DexcludeTransitive=true && ls target/dependency
+    - name: Log in to the Container registry
+      uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+    - name: Build and push Docker image
+      id: push
+      uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+      with:
+        context: .
+        push: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+    - name: Generate artifact attestation
+      uses: actions/attest-build-provenance@v1
+      with:
+        subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+        subject-digest: ${{ steps.push.outputs.digest }}
+        push-to-registry: true