Update Docker image build workflow

.github/workflows/docker-image.yml

@@ -15,43 +15,71 @@ jobs:
  build:
  runs-on: ubuntu-latest
  env:
- REPO: 'sampleapi'
+ IMAGE_NAME: 'sampleapi'
  TAG: ${{ github.sha }}
  steps:
  - name: Checkout
  uses: actions/checkout@v4
- - name: Set up QEMU
- uses: docker/setup-qemu-action@v3
+ # Install the cosign tool except on PR
+ # https://github.com/sigstore/cosign-installer
+ - name: Install cosign
+ if: github.event_name != 'pull_request'
+ uses: sigstore/cosign-installer@3
+ with:
+ cosign-release: 'v2.1.1'
+ # Set up BuildKit Docker container builder to be able to build
+ # multi-platform images and export cache
+ # https://github.com/docker/setup-buildx-action
  - name: Set up Docker Buildx
- uses: docker/setup-buildx-action@v3
- - name: Login to Docker 
+ uses: docker/setup-buildx-action@3
+
+ # Login against a Docker registry except on PR
+ # https://github.com/docker/login-action
+ - name: Log into registry ${{ vars.DOCKER_LOGIN_SERVER }}
+ if: github.event_name != 'pull_request'
  uses: docker/login-action@v3
  with:
  registry: ${{ vars.DOCKER_LOGIN_SERVER }}
  username: ${{ secrets.DOCKER_USERNAME }}
  password: ${{ secrets.DOCKER_TOKEN }}
+ # Extract metadata (tags, labels) for Docker
+ # https://github.com/docker/metadata-action
+ - name: Extract Docker metadata
+ id: meta
+ uses: docker/metadata-action@5
+ with:
+ images: ${{ vars.DOCKER_LOGIN_SERVER }}/${{ env.IMAGE_NAME }}
+
  - name: Build Docker Image
  uses: docker/build-push-action@v5
  with:
  context: src/SampleApi
- load: true
- push: false
- tags: ${{ env.REPO }}:${{ env.TAG }}
+ push: ${{ github.event_name != 'pull_request' }}
+ tags: ${{ steps.meta.outputs.tags }}
+ labels: ${{ steps.meta.outputs.labels }}
+ cache-from: type=gha
+ cache-to: type=gha,mode=max
  - name: Run Trivy vulnerability scanner
  uses: aquasecurity/trivy-action@master
  with:
- image-ref: 'docker.io/library/${{ env.REPO }}:${{ env.TAG }}'
+ image-ref: 'docker.io/library/${{ env.IMAGE_NAME }}:${{ env.TAG }}'
  format: 'github'
  github-pat: ${{ github.token }}
  env:
  TRIVY_USERNAME: Username
  TRIVY_PASSWORD: Password
 
- - name: Push image to ACR
- uses: docker/build-push-action@v5
- with:
- context: src/SampleApi
- push: true
- tags: |
- ${{ vars.DOCKER_LOGIN_SERVER }}/${{ env.REPO }}:latest
- ${{ vars.DOCKER_LOGIN_SERVER }}/${{ env.REPO }}:${{ env.TAG }}
+ # Sign the resulting Docker image digest except on PRs.
+ # This will only write to the public Rekor transparency log when the Docker
+ # repository is public to avoid leaking data. If you would like to publish
+ # transparency data even for private images, pass --force to cosign below.
+ # https://github.com/sigstore/cosign
+ - name: Sign the published Docker image
+ if: ${{ github.event_name != 'pull_request' }}
+ env:
+ # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+ TAGS: ${{ steps.meta.outputs.tags }}
+ DIGEST: ${{ steps.build-and-push.outputs.digest }}
+ # This step uses the identity token to provision an ephemeral certificate
+ # against the sigstore community Fulcio instance.
+ run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}