docker-mailserver/.github/workflows/scheduled_builds.yml

name: "Build Stable on Schedule"

on:
  schedule:
    - cron: "0 0 * * 5"

jobs:
  publish:
    runs-on: ubuntu-20.04
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          ref: stable
          submodules: recursive
      - name: Prepare
        id: prep
        run: |
          TAGS=${{ secrets.DOCKER_REPOSITORY }}:stable
          echo ::set-output name=tags::${TAGS}          
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
        id: buildx
      - name: Login to DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      - name: Build image locally
        uses: docker/build-push-action@v2
        with:
          builder: ${{ steps.buildx.outputs.name }}
          context: .
          file: ./Dockerfile
          build-args: |
            VCS_REF=${{ github.sha }}
            VCS_VER=${{ github.ref }}            
          platforms: linux/amd64,linux/arm/v7,linux/arm64
          push: true
          tags: ${{ steps.prep.outputs.tags }}