docker-image.yml

name: Docker Image CI

on:
  workflow_dispatch:
  push:
    branches: [main]
    paths:
      - 'src/**'
  pull_request:
    branches: [main]
    paths:
      - 'src/**'

jobs:
  build:
    runs-on: ubuntu-latest
    env:
      IMAGE_NAME: 'sampleapi'
      TAG: ${{ github.sha }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      # 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@v3
        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

      # 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@v5
        with:
          images: ${{ vars.DOCKER_LOGIN_SERVER }}/${{ env.IMAGE_NAME }}

      - name: Build Docker Image
        uses: docker/build-push-action@v5
        with:
          context: src/SampleApi
          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: ${{ fromJSON(steps.build-and-push.outputs.metadata)['image.name'] }}
          format: 'github'
          github-pat: ${{ github.token }}
        env:
          TRIVY_USERNAME: Username
          TRIVY_PASSWORD: Password

      # 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}