docker.yaml

name: Publish Docker Images

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  workflow_dispatch: {}

permissions:
  contents: read
  packages: write

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}-docker
  cancel-in-progress: true

jobs:
  discover:
    name: Discover functions
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.find.outputs.matrix }}
    steps:
      - name: Checkout
        uses: actions/checkout@v5

      - name: Find functions from handler.json
        id: find
        run: |
          entries=$(
            for f in functions/*/handler.json; do
              [ -f "$f" ] || continue
              name=$(jq -r .name "$f")
              dir=$(basename "$(dirname "$f")")
              echo "{\"name\":\"$name\",\"dir\":\"$dir\"}"
            done | jq -s -c '.'
          )
          echo "matrix={\"include\":$entries}" >> "$GITHUB_OUTPUT"
          echo "Discovered functions: $entries"

  build:
    name: Build ${{ matrix.name }}-fn
    needs: discover
    runs-on: ubuntu-latest
    if: ${{ needs.discover.outputs.matrix != '{"include":[]}' }}

    strategy:
      fail-fast: false
      matrix: ${{ fromJSON(needs.discover.outputs.matrix) }}

    env:
      REGISTRY: ghcr.io

    steps:
      - name: Checkout
        uses: actions/checkout@v5

      - name: Setup pnpm
        uses: pnpm/action-setup@v6

      # Pinned to v4: setup-node@v5 auto-detects pnpm via the
      # packageManager field in package.json and tries to cache the
      # store, which fails here because this workflow doesn't run
      # `pnpm install` on the runner — the store path doesn't exist
      # and v5 promotes the "missing path" warning to an error.
      # Sticking to v4 until v5's auto-cache can be opted out cleanly.
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '22'

      - name: Generate Dockerfile
        run: |
          node --experimental-strip-types scripts/generate.ts --only=${{ matrix.dir }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - name: Log in to GHCR
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v4
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ matrix.name }}-fn
          tags: |
            type=ref,event=tag
            type=semver,pattern={{version}}
            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
            type=sha,format=short,prefix=

      - name: Build and push
        uses: docker/build-push-action@v7
        with:
          context: .
          file: generated/${{ matrix.dir }}/Dockerfile
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          cache-from: type=gha,scope=${{ matrix.name }}
          cache-to: type=gha,mode=max,scope=${{ matrix.name }}