docker.yml

name: Docker Build & Publish

on:
  push:
    branches:
      - "**"
    tags:
      - "v*.*.*"
  pull_request:
    branches:
      - main

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

jobs:
  build:
    name: Build & Push
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

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

      - name: Normalise image name to lowercase
        run: echo "IMAGE_NAME=${IMAGE_NAME,,}" >> "$GITHUB_ENV"

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

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

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            # Nightly: one tag per branch (e.g. ghcr.io/org/repo:main)
            type=ref,event=branch
            # PR builds are tagged but not pushed
            type=ref,event=pr
            # Semver release tags: v1.2.3 → :1.2.3, :1.2, :1, :latest
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
          labels: |
            org.opencontainers.image.title=Chroma Transfer
            org.opencontainers.image.description=Web UI for sending embroidery files to Ricoma machines

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          # Registry cache is required for multi-platform builds.
          # The GHA cache backend only supports a single platform per cache
          # entry and would produce incomplete manifests for multi-arch images.
          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:cache
          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:cache,mode=max