name: Publish

# Builds `:X.Y.Z` and `:latest` tags of `ghcr.io/.../trawl` from
# `apps/api/Dockerfile` on `v*` release tag pushes. The `v` prefix is stripped
# per Docker convention (git tag `v1.0.0` -> docker tag `1.0.0`); `:latest`
# auto-attaches via the default `latest=auto` flavor of `type=semver`.
#
# Lives separately from publish-nightly.yml (main branch pushes) and
# publish-baseline.yml (baseline runtime pushes). `v*-baseline` is
# intentionally excluded so a baseline-only release doesn't also push
# `:X.Y.Z`/`:latest` — publish-baseline.yml owns that path.
#
# Tag contract:
#   - push `v*` -> :X.Y.Z + :latest
#   - push `v*-baseline` -> nothing here (excluded)
#   - push `main` -> nothing here (handled by publish-nightly.yml)

on:
  push:
    tags:
      # Release tags — pure semver only. `v*-baseline` is intentionally excluded
      # so a baseline-only release (e.g., `v1.0.0-baseline`) does NOT push `:X.Y.Z`
      # or `:latest` from this workflow; publish-baseline.yml owns that path.
      - "v*"
      - "!v*-baseline"

env:
  IMAGE: ghcr.io/${{ github.repository_owner }}/trawl

jobs:
  build:
    strategy:
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm

    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/checkout@v7

      - uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: docker/setup-buildx-action@v4

      - uses: docker/metadata-action@v6
        id: meta
        with:
          images: ${{ env.IMAGE }}

      - name: Sanitize platform name
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - uses: docker/build-push-action@v7
        id: build
        with:
          context: .
          file: apps/api/Dockerfile
          platforms: ${{ matrix.platform }}
          push: true
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true
          cache-from: type=gha,scope=trawl-release-${{ matrix.platform }}
          cache-to: type=gha,scope=trawl-release-${{ matrix.platform }},mode=max
          secrets: |
            GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - uses: actions/upload-artifact@v7
        with:
          name: digests-release-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    runs-on: ubuntu-latest
    needs: build
    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/download-artifact@v8
        with:
          path: /tmp/digests
          pattern: digests-release-*
          merge-multiple: true

      - uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: docker/setup-buildx-action@v4

      - uses: docker/metadata-action@v6
        id: meta
        with:
          images: ${{ env.IMAGE }}
          tags: |
            # Versioned release tag: git tag v1.0.0 → docker tag 1.0.0 (strips the v prefix,
            # per Docker convention; type=ref would mirror the v through). type=semver also
            # auto-attaches :latest via the default latest=auto flavor.
            type=semver,pattern={{version}}

      - name: Create and push multi-arch manifest
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create \
            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.IMAGE }}@sha256:%s ' *)

      - name: Inspect manifest
        run: |
          # Pull the first tag actually pushed by docker/metadata-action in the previous
          # step. DOCKER_METADATA_OUTPUT_JSON.tags[] is already fully-qualified
          # ("ghcr.io/germondai/trawl:1.0.0" / ":latest") so no $IMAGE prefix needed.
          tag=$(jq -r '.tags[0]' <<< "$DOCKER_METADATA_OUTPUT_JSON")
          docker buildx imagetools inspect "$tag"