build-image.yml

# Build the CompHost production image and publish it to GitHub Container
# Registry on every push to main, on version tags, and on manual runs.
#
# Published as:
#   ghcr.io/unsortedcode/comphost:latest      (develop)
#   ghcr.io/unsortedcode/comphost:<short-sha> (every build)
#   ghcr.io/unsortedcode/comphost:v1.2.3      (on a v* tag)
#
# Auth uses the automatic GITHUB_TOKEN — no secrets to configure. The package is
# created private on first publish; make it public under
# Packages → comphost → Package settings → Change visibility.
name: build-image

on:
  push:
    branches: [develop]
    tags: ["v*"]
  workflow_dispatch: {}

# Don't waste minutes: a newer push to the same ref cancels the older run.
concurrency:
  group: build-image-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

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

      - name: Set up Docker 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 }}

      # Registry paths must be lowercase; the repo name is not.
      - name: Compute image name and tags
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/${{ github.repository_owner }}/comphost
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=sha,format=short,prefix=
            type=semver,pattern=v{{version}}
            type=semver,pattern=v{{major}}.{{minor}}

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          file: docker/comphost.Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          # Layer cache in the Actions cache, so repeat builds skip the frontend
          # compile when nothing in it changed.
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Report
        run: |
          echo "Published:"
          echo "${{ steps.meta.outputs.tags }}"