core.yml

name: core
run-name: Triggered by ${{ github.event_name }} to ${{ github.ref }} by @${{ github.actor }}

on:
  push:
    branches:
      - "**"
    tags:
      - "**"

jobs:
  build:
    runs-on: ${{ matrix.runner }}
    name: Build ${{ matrix.platform }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-24.04
          - platform: linux/arm64
            runner: ubuntu-24.04-arm

    permissions:
      contents: read
      packages: write

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

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

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

      - name: Generate platform pair
        id: platform
        run: |
          platform=${{ matrix.platform }}
          echo "pair=${platform//\//-}" >> $GITHUB_OUTPUT

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v5
        with:
          context: core
          platforms: ${{ matrix.platform }}
          outputs: type=image,name=ghcr.io/gaucho-racing/sentinel-core,push-by-digest=true,name-canonical=true,push=true
          # Per-workflow + per-ref cache scopes. Without github.workflow,
          # core/oauth/discord would all race on `build-<pair>` since they
          # fire on every push. Without github.ref_name, simultaneous
          # main+tag pushes from a release commit race on the same scope
          # and can poison each other's layers (the same class of bug hit
          # mapache on v1.2.x: :latest ended up with a 0-byte binary).
          # Tag/feature builds fall back to main's cache to stay warm.
          cache-from: |
            type=gha,scope=build-${{ github.workflow }}-${{ steps.platform.outputs.pair }}-${{ github.ref_name }}
            type=gha,scope=build-${{ github.workflow }}-${{ steps.platform.outputs.pair }}-main
          cache-to: type=gha,scope=build-${{ github.workflow }}-${{ steps.platform.outputs.pair }}-${{ github.ref_name }},mode=max

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

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ steps.platform.outputs.pair }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    runs-on: ubuntu-latest
    name: Merge manifests
    needs: build

    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          fetch-tags: true

      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

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

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

      - name: Check if this commit has a release tag
        id: release
        run: |
          tag=$(git tag --points-at HEAD | grep '^v' | head -n1)
          if [ -n "$tag" ]; then
            echo "Found tag: $tag"
            if gh release view "$tag" --json tagName > /dev/null 2>&1; then
              echo "release_tag=$tag" >> $GITHUB_OUTPUT
              echo "is_release=true" >> $GITHUB_OUTPUT
              exit 0
            fi
          fi
          echo "is_release=false" >> $GITHUB_OUTPUT
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Generate tag list
        id: tags
        shell: bash
        run: |
          TAGS="type=sha"

          if [ "${GITHUB_REF_TYPE}" = "branch" ] && [ "${GITHUB_REF_NAME}" = "main" ]; then
            TAGS="${TAGS}\ntype=raw,value=latest"
          fi

          if [ "${{ steps.release.outputs.is_release }}" = "true" ]; then
            CLEAN_TAG=$(echo "${{ steps.release.outputs.release_tag }}" | sed 's/^v//')
            TAGS="${TAGS}\ntype=raw,value=${CLEAN_TAG}"
          fi

          echo -e "tags<<EOF\n$TAGS\nEOF" >> $GITHUB_OUTPUT

      - name: Extract image metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/gaucho-racing/sentinel-core
          tags: ${{ steps.tags.outputs.tags }}

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf 'ghcr.io/gaucho-racing/sentinel-core@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ghcr.io/gaucho-racing/sentinel-core:${{ steps.meta.outputs.version }}