docker-cd.yaml

# docker continuous delivery
# deliver docker images to configured repo with tags to match branches and git tags
---
name: Publish Docker
on: [push]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout git commit
        uses: actions/checkout@master

      - name: Publish to Dockerhub registry
        # todo: pin to hash
        uses: elgohr/Publish-Docker-Github-Action@3.04
        with:
          # https://help.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions
          name: ${{ github.repository }}
          # configured at repo settings/secrets
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
          # create docker image tags to match git tags
          tag_names: true