name: Publish Docker image

# Community Applications installs a PREBUILT image — it never builds from source.
# This publishes ghcr.io/asherflynt/music-librarian on every push to main and on
# every version tag, so the CA template always has an image to pull.

on:
  push:
    branches: [main]
    tags: ["v*"]
  workflow_dispatch:

concurrency:
  group: publish-${{ github.ref }}
  cancel-in-progress: true

env:
  IMAGE: ghcr.io/${{ github.repository }}

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write   # push to GHCR under this repo — no external secrets needed
    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

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

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Docker metadata (tags + labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=ref,event=tag
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha,format=short

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max