publish.yml

name: Create and publish Docker images

on:
  push:
    branches: ['main']

env:
  REGISTRY: ghcr.io
  IMAGE_NAMES: debian ubuntu

jobs:
  build-and-push-images:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      attestations: write
      id-token: write
      
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Log in to the Container registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
          
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Build and push Docker images
        run: |
          REPO_NAME=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
          for IMAGE_NAME in ${{ env.IMAGE_NAMES }}; do
            echo "Building and pushing $IMAGE_NAME"
            docker build -t ${{ env.REGISTRY }}/${REPO_NAME}:$IMAGE_NAME images/$IMAGE_NAME
            docker push ${{ env.REGISTRY }}/${REPO_NAME}:$IMAGE_NAME
          done
      
      - name: Generate artifact attestations for Docker images
        run: |
          REPO_NAME=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
          for IMAGE_NAME in ${{ env.IMAGE_NAMES }}; do
            echo "Generating attestation for $IMAGE_NAME"
            IMAGE_DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' ${{ env.REGISTRY }}/${REPO_NAME}:$IMAGE_NAME)
            echo "Digest: $IMAGE_DIGEST"
            gh actions upload-artifact $IMAGE_NAME-attestation --path $IMAGE_DIGEST
          done