docker-publish.yml

name: Docker Build and Publish

# This workflow uses actions that are not certified by GitHub.
# They are provided by a third-party and are governed by
# separate terms of service, privacy policy, and support
# documentation.

on:
  schedule:
    - cron: "22 3 26 * *" # rebuild every month on the 26th day
  pull_request:
    types: [opened, synchronize, reopened, ready_for_review]
    paths:
      - "environment.yml"
      - "pyproject.toml"
      - "poetry.lock"
      - "cloud/images/**"
      - ".github/**"
  push:
    branches:
      - main
    tags: ["v*.*.*"]
    paths:
      - "environment.yml"
      - "pyproject.toml"
      - "poetry.lock"
      - "cloud/images/**"
      - ".github/**"

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io

jobs:
  build:
    if: github.event.pull_request.draft == false
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        include:
          - NAME: smalldev
    permissions:
      contents: read
      packages: write
      # This is used to complete the identity challenge
      # with sigstore/fulcio when running outside of PRs.
      id-token: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      # Install the cosign tool except on PR
      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        uses: sigstore/cosign-installer@v2
        with:
          cosign-release: "v1.13.1"

      # Workaround: https://github.com/docker/build-push-action/issues/461
      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@v2

      # Login against a Docker registry except on PR
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: |
            ${{ env.REGISTRY }}/confirm-solutions/${{ matrix.NAME }}
          tags: |
            # set latest tag for default branch
            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
            type=ref,event=pr
            type=sha

      # Build and push Docker image with Buildx (don't push on PR)
      # 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: .
          file: ./cloud/images/${{ matrix.NAME }}/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      # 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
        env:
          COSIGN_EXPERIMENTAL: "true"
        # This step uses the identity token to provision an ephemeral certificate
        # against the sigstore community Fulcio instance.
        run: echo "${{ steps.meta.outputs.tags }}" | xargs -I {} cosign sign {}@${{ steps.build-and-push.outputs.digest }}