docker-publish.yml

name: docker

on:
  push:
    branches: [ docker ]
    tags: [ '*.*.*' ]
  pull_request:
    branches: [ docker ]

env:
  REGISTRY: docker.io
  IMAGE_NAME: ${{ github.repository }}
  
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:

    runs-on: ubuntu-20.04
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Set up QEMU
        id: qemu
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Log into Docker Hub
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          flavor: |
             latest=true

      - name: Build and push Docker image
        uses: docker/build-push-action@v3
        with:
          context: .
          platforms: linux/amd64, linux/arm/v6, linux/arm64/v8
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}