trawl/.github/workflows/publish-nightly.yml

name: Publish Nightly

# Builds the disposable `:nightly` and `:nightly-<sha>` tags of
# `ghcr.io/.../trawl` from `apps/api/Dockerfile` on every push to `main`.
#
# Lives separately from publish.yml (release builds on `v*` tags) and
# publish-baseline.yml (baseline runtime builds on `v*`/`*-baseline` tags)
# so:
#   - `v*` tag pushes never trigger a nightly rebuild (release is exclusive)
#   - main pushes never trigger a release/baseline rebuild
#   - each workflow has its own GHA cache scope (no cross-pollution)
#
# Tag contract:
#   - push to `main` -> :nightly-<sha> + :nightly
#   - `:latest` is intentionally NOT touched here — that's owned by
#     publish.yml and only moves on `v*` release pushes.

on:
  push:
    branches: [main]

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-nightly-${{ matrix.platform }}
          cache-to: type=gha,scope=trawl-nightly-${{ 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-nightly-${{ 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-nightly-*
          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: |
            # main branch push → :nightly (disposable test build).
            type=raw,value=nightly
            # main branch push → :nightly-<sha> for traceability.
            type=sha,prefix=nightly-

      - 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:nightly-…") so no $IMAGE
          # prefix needed — the legacy logic re-derived from github.ref /
          # github.sha which disagreed with what got pushed (type=sha writes
          # short 7-char SHA but github.sha is the full 40-char hash).
          tag=$(jq -r '.tags[0]' <<< "$DOCKER_METADATA_OUTPUT_JSON")
          docker buildx imagetools inspect "$tag"