theme.park/.github/workflows/docker-build.yml

name: docker build
on:
  release:
    types:
      - released
  workflow_dispatch:
    inputs:
      branch:
        description: 'Select branch'
        required: true
        type: choice
        options:
        - testing
      tag:
        description: 'Add a tag'
  push:
    branches:
      - testing
    paths-ignore:
        - '.github/**'
jobs:
  push_to_ghcr_io:
    runs-on: ubuntu-latest
    steps:
      - name: checkout
        uses: actions/checkout@v2
        with:
          fetch-depth: 0
      - name: Get the version
        id: get_version
        run: echo ::set-output name=VERSION::${{ github.event.release.tag_name }}
      - name: Set current date as env variable
        id: date_time
        run: echo ::set-output name=NOW::$(date +'%Y-%m-%dT%H:%M:%S')
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
      - name: Docker meta
        id: metadata # you'll use this in the next step
        uses: docker/metadata-action@v3
        with:
          # list of Docker images to use as base name for tags
          images: |
                        ghcr.io/gilbn/theme.park
          # Docker tags based on the following events/attributes
          tags: |
                        testing
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GH_PAT }}
      - name: build&push testing
        if: ${{ github.ref == 'refs/heads/testing' || github.event.inputs.branch == 'testing' }}
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: linux/amd64,linux/arm/v8
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.metadata.outputs.tags }}
          labels: ${{ steps.metadata.outputs.labels }}