puter/.github/workflows/docker-image.yaml

name: Docker Image CI

# Builds only on calver tag pushes: YY.MM or YY.MM.p (all numeric).
# Each build publishes three tags: <version>, latest, main.
on:
  push:
    tags:
      - '[0-9][0-9].[0-9][0-9]'
      - '[0-9][0-9].[0-9][0-9].[0-9]*'

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

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest

    permissions:
      contents: read
      packages: write

    steps:
      - name: Validate calver tag
        env:
          REF_NAME: ${{ github.ref_name }}
        run: |
          if ! [[ "$REF_NAME" =~ ^[0-9]{2}\.[0-9]{2}(\.[0-9]+)?$ ]]; then
            echo "Tag '$REF_NAME' does not match YY.MM or YY.MM.p calver format."
            exit 1
          fi

      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Log in to GitHub Package Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: "${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}"
          tags: |
            type=ref,event=tag
            type=raw,value=latest
            type=raw,value=main

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          platforms: linux/amd64,linux/arm64
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max