build_and_push_ghcr.yml

name: Build a Docker image and push it to the GitHub container registry

on:
  push:
    branches: [ 'main' ]
    tags: [ '*.*.*' ]

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      # https://github.com/actions/checkout
      - name: Checkout repository
        uses: actions/checkout@v3

      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@main
        with:
          cosign-release: 'v2.0.1'

      # https://github.com/docker/setup-buildx-action
      - name: Set up Docker buildx
        uses: docker/setup-buildx-action@v2

      # https://github.com/docker/login-action
      - name: Log into ghcr.io
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ghcr.io/${{ github.repository }}

      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v4
        with:
          context: .
          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

      # https://github.com/sigstore/cosign
      - name: Sign the published Docker image
        if: github.event_name != 'pull_request'
        env:
          COSIGN_EXPERIMENTAL: "true"
        run: echo "${{ steps.meta.outputs.tags }}" | xargs -I {} cosign sign -y {}@${{ steps.build-and-push.outputs.digest }}

      # https://github.com/docker/login-action
      - name: Log into Docker Hub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          registry: docker.io
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}

      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta-docker
        uses: docker/metadata-action@v4
        with:
          images: docker.io/${{ secrets.DOCKERHUB_IMAGE_NAME }}

      # https://github.com/docker/build-push-action
      - name: Build and push Docker image to Docker Hub
        if: github.event_name != 'pull_request'
        uses: docker/build-push-action@v2
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta-docker.outputs.tags }}
          labels: ${{ steps.meta-docker.outputs.labels }}