matrix-optimizer

# Matrix Optimizer

Configure and optimize GitHub Actions matrix strategies for efficient multi-version and multi-platform testing.

## Quick Start

Basic matrix for testing multiple Node.js versions:
```yaml
strategy:
  matrix:
    node-version: [16, 18, 20]
```

## Instructions

### Step 1: Identify Matrix Dimensions

**Common matrix dimensions:**
- **Language versions**: Node.js, Python, Ruby, Go versions
- **Operating systems**: ubuntu, macos, windows
- **Architectures**: x64, arm64
- **Dependency versions**: Database versions, framework versions
- **Feature flags**: Different configuration options

**Example dimensions:**
```yaml
strategy:
  matrix:
    os: [ubuntu-latest, macos-latest, windows-latest]
    node-version: [16, 18, 20]
    # This creates 9 jobs (3 OS × 3 versions)
```

### Step 2: Configure Matrix Strategy

**Basic matrix:**
```yaml
jobs:
  test:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest, macos-latest]
        node-version: [18, 20]
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-node@v3
        with:
          node-version: ${{ matrix.node-version }}
      - run: npm test
```

**Matrix with include:**
```yaml
strategy:
  matrix:
    os: [ubuntu-latest, macos-latest]
    node-version: [18, 20]
    include:
      # Add specific combination
      - os: windows-latest
        node-version: 20
      # Add extra variables for specific combination
      - os: ubuntu-latest
        node-version: 20
        experimental: true
```

**Matrix with exclude:**
```yaml
strategy:
  matrix:
    os: [ubuntu-latest, macos-latest, windows-latest]
    node-version: [16, 18, 20]
    exclude:
      # Skip Node 16 on Windows
      - os: windows-latest
        node-version: 16
      # Skip Node 16 on macOS
      - os: macos-latest
        node-version: 16
```

### Step 3: Optimize for Cost and Speed

**Fail-fast strategy:**
```yaml
strategy:
  fail-fast: false  # Continue all jobs even if one fails
  mat