docker-build-push.yml

---
name: docker-build-push

on:
  push:
    branches:
      - 'master'
  release:
    types:
      - 'published'

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Log in to the Container registry
        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Prepare lowercase variable
        run: |
          echo IMAGE_REPOSITORY=$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV

      - name: Build and push Docker image (development)
        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
        with:
          context: .
          push: true
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_REPOSITORY }}:edge

      - name: Build and push Docker image (latest + tag)
        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
        if: ${{ github.event_name == 'release' }}
        with:
          context: .
          push: true
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_REPOSITORY }}:latest
            ${{ env.REGISTRY }}/${{ env.IMAGE_REPOSITORY }}:${{ github.event.release.tag_name }}

      - name: Build and push Docker image (stable)
        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
        if: ${{ github.event_name == 'release' && github.event.release.prerelease == false }}
        with:
          context: .
          push: true
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_REPOSITORY }}:stable