build-container.yml

# Based on the example from https://docs.github.com/en/actions/publishing-packages/publishing-docker-images
name: Create and publish a Docker image

on:
  push:
    branches:
      - 'main'
      - 'next'
      - 'v202[0-9].[0-9].x'
    tags:
      - 'v*'
  pull_request:

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

jobs:
  build-and-push-image:
    runs-on: ubuntu-22.04
    permissions: write-all
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - name: Log in to the Container registry
        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567
        if: ${{ github.repository_owner == 'freifunk-gluon' && github.event_name == 'push' }}
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
      - name: Build and push Docker image
        uses: docker/build-push-action@48aba3b46d1b1fec4febb7c5d0c644b249a11355
        with:
          context: ./contrib/docker
          push: ${{ github.repository_owner == 'freifunk-gluon' && github.event_name == 'push' }}
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}