docker-image-build.yml

name: Image build and publish
on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main
env:
  REGISTRY: ghcr.io
  IMAGE_NAME: '${{ github.repository }}'
jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write
    steps:
      - uses: actions/checkout@v2
      - name: Build the Docker image
        run: 'docker build . --file Dockerfile --tag my-image-name:$(date +%s)'
      - name: Checkout repository
        uses: actions/checkout@v2
      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@1e95c1de343b5b0c23352d6417ee3e48d5bcd422
        with:
          cosign-release: v1.4.0
      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf
      - name: 'Log into registry ${{ env.REGISTRY }}'
        if: github.event_name != 'pull_request'
        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
        with:
          registry: '${{ env.REGISTRY }}'
          username: '${{ github.actor }}'
          password: '${{ secrets.GITHUB_TOKEN }}'
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
        with:
          images: '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}'
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
        with:
          context: .
          push: '${{ github.event_name != ''pull_request'' }}'
          tags: '${{ steps.meta.outputs.tags }}'
          labels: '${{ steps.meta.outputs.labels }}'
      - name: Sign the published Docker image
        if: '${{ github.event_name != ''pull_request'' }}'
        env:
          COSIGN_EXPERIMENTAL: 'true'
        run: >-
          cosign sign ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{
          steps.build-and-push.outputs.digest }}