GitHub Actions Matrix Optimization & Cache Acceleration Architecture

name: High-Velocity Matrix & Docker Pipeline

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  # Stage 1: Parallel Matrix Lint & Unit Tests
  test-matrix:
    name: Test (${{ matrix.os }} - Node ${{ matrix.node }})
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      max-parallel: 6
      matrix:
        os: [ubuntu-latest, macos-latest]
        node: [20, 22]
        include:
          # Special Canary Architecture
          - os: ubuntu-latest
            node: 22
            experimental: true

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

      - name: Setup Node Runtime with Built-in Cache
        uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node }}
          cache: 'npm'

      - name: Install Dependencies
        run: npm ci --prefer-offline

      - name: Run Test Suite
        run: npm test -- --coverage
        continue-on-error: ${{ matrix.experimental == true }}

  # Stage 2: Docker Build with GHA Layer Caching
  docker-publish:
    name: Build & Cache Docker Container
    runs-on: ubuntu-latest
    needs: test-matrix
    steps:
      - name: Checkout Code
        uses: actions/checkout@v4

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

      - name: Build and Push Docker Image with GHA Caching
        uses: docker/build-push-action@v6
        with:
          context: .
          push: false
          tags: app:latest
          # Fetch layers from GitHub Actions Cache
          cache-from: type=gha
          # Store multi-stage build layers into GitHub Cache
          cache-to: type=gha,mode=max