build_and_push_docker_image.yml

name: Docker image build and push

on:
  push:
    branches:
      - main

permissions:
  packages: write

jobs:
  clean-ghcr:
    runs-on: ubuntu-latest
    steps:
      - name: determine repository name
        run: echo "REPOSITORY_NAME=$(echo '${{ github.repository }}' | awk -F '/' '{print $2}')" >> $GITHUB_ENV
        shell: bash
      - name: prune untagged images older than 24 hours
        uses: snok/container-retention-policy@v1
        with:
          image-names: ${{ env.REPOSITORY_NAME }}
          cut-off: A day ago UTC
          account-type: org
          org-name: ${{ github.repository_owner }}'
          untagged-only: true
          token: ${{ secrets.GITHUB_TOKEN }}
  build:
    runs-on: ubuntu-latest
    steps:
      - name: checkout source
        uses: actions/checkout@v2
      - name: set up QEMU for Docker buildx
        uses: docker/setup-qemu-action@v1
      - name: set up Docker buildx
        uses: docker/setup-buildx-action@v1
      - name: login to ghcr.io
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: docker meta
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: ghcr.io/${{ github.repository }}
          tags: latest
      - name: build and push Docker image
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: linux/amd64,linux/arm64,linux/ppc64le,linux/s390x
          push: true
          tags: ${{ steps.meta.outputs.tags }}