ci.yml

name: Publish Docker image

# https://github.community/t/how-to-trigger-an-action-on-push-or-pull-request-but-not-both/16662
on:
  # Trigger the workflow on push or pull request,
  # but only for the master branch
  schedule:
    - cron: "0 10 * * *" # nightly at 10am
  push:
    branches:
      - master
    paths:
      - 'Dockerfile'
  pull_request:
    branches:
      - master
    paths:
      - 'Dockerfile'
  #tags:
  #  - "v*.*.*"
  #push:
  #  branches:
  #    - master
  #pull_request:
  #  branches:
  #    - master

jobs:
  push_to_registries:
    name: Push Docker image to multiple registries
    runs-on: ubuntu-latest
    steps:
      - name: Check out the repo
        uses: actions/checkout@v2
      - # https://github.com/marketplace/actions/build-and-push-docker-images
        name: Prepare tags
        id: prep
        run: |
          for DOCKER_IMAGE in "techenthusiasts/miniconda"; do # "ghcr.io/techenthusiasts/miniconda"; do
            VERSION=noop
            if [ "${{ github.event_name }}" = "schedule" ]; then
              VERSION=nightly
            elif [[ $GITHUB_REF == refs/tags/* ]]; then
              VERSION=${GITHUB_REF#refs/tags/}
            elif [[ $GITHUB_REF == refs/heads/* ]]; then
              VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
              if [ "${{ github.event.repository.default_branch }}" = "$VERSION" ]; then
                VERSION=edge
              fi
            elif [[ $GITHUB_REF == refs/pull/* ]]; then
              VERSION=pr-${{ github.event.number }}
            fi
            TAGS="${DOCKER_IMAGE}:${VERSION}"
            if [[ $VERSION =~ ^v[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
              MINOR=${VERSION%.*}
              MAJOR=${MINOR%.*}
              TAGS="$TAGS,${DOCKER_IMAGE}:${MINOR},${DOCKER_IMAGE}:${MAJOR},${DOCKER_IMAGE}:latest"
            elif [ "${{ github.event_name }}" = "push" ]; then
              TAGS="$TAGS,${DOCKER_IMAGE}:sha-${GITHUB_SHA::8}"
            fi
          done
          echo "repository owner: ${{ github.repository_owner }}"
          echo "image tags: ${TAGS}"
          echo ::set-output name=version::${VERSION}
          echo ::set-output name=tags::${TAGS}
          echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
      - name: Login to DockerHub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.CR_PAT }}
      - # https://github.com/marketplace/actions/build-and-push-docker-images
        name: Build and push
        id: docker_build
        uses: docker/build-push-action@v3
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64 # ,linux/arm64,linux/386
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.prep.outputs.tags }}
          labels: |
            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
            org.opencontainers.image.source=${{ github.repositoryUrl }}
            org.opencontainers.image.version=${{ steps.prep.outputs.version }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.licenses=${{ github.event.repository.license.name }}