name: Container image

# Three modes, all driven by the same job:
#   - Tag push (v*)      → full release: :v1.2.3, :1.2, :latest, :sha-<short>
#   - Branch push        → canary:        :<branch>, :sha-<short>
#   - Pull request       → smoke test:    build only, nothing pushed
#
# metadata-action emits the right subset of tags for each event based
# on the `tags:` rules below — no manual branching needed.
on:
  push:
    branches:
      - '**'
    tags:
      - 'v*'
  pull_request:

permissions:
  contents: read
  packages: write

jobs:
  image:
    runs-on: ubuntu-latest
    # The default `ubuntu-latest` label on aether-runner maps to
    # `node:16-bullseye`, which has no docker CLI. Override to an
    # act-compatible image that ships docker + buildx. The runner
    # already bind-mounts /var/run/docker.sock into every job
    # container, so we do NOT add a `volumes:` entry — doing so
    # produces a duplicate-mount error from the daemon.
    container:
      image: catthehacker/ubuntu:act-latest
    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

      # github.repository is owner/name in the repo's original casing;
      # registries require lowercase. Normalise once and reuse below.
      - name: Resolve image name
        id: img
        run: |
          repo='${{ github.repository }}'
          echo "ref=git.cer.sh/${repo,,}" >> "$GITHUB_OUTPUT"

      # Version stamp baked into the binary via -ldflags. Tag pushes
      # use the tag name directly; everything else gets a short SHA
      # suffix so `qu version` on a canary build is debuggable.
      - name: Compute version
        id: ver
        run: |
          if [[ "$GITHUB_REF" == refs/tags/* ]]; then
            v="${GITHUB_REF_NAME}"
          else
            v="${GITHUB_REF_NAME}-${GITHUB_SHA:0:7}"
          fi
          echo "version=$v" >> "$GITHUB_OUTPUT"

      - name: Login to Gitea registry
        if: github.event_name == 'push'
        uses: docker/login-action@v3
        with:
          registry: git.cer.sh
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ steps.img.outputs.ref }}
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
            type=ref,event=branch
            type=sha,prefix=sha-,format=short

      - name: Build (and push on push events)
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name == 'push' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            VERSION=${{ steps.ver.outputs.version }}
          # Inline cache embeds layer metadata into the pushed image
          # itself — no external cache server needed, which keeps the
          # workflow self-contained on the Gitea runner.
          cache-from: type=inline
          cache-to: type=inline