GitHub Actions CI/CD Advanced Guide

jobs:
  test:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest]
        node: [18, 20, 22]
        exclude:
          - os: macos-latest
            node: 18
        include:
          - os: ubuntu-latest
            node: 22
            coverage: true
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node }}
      - run: npm ci
      - run: npm test
      - if: matrix.coverage
        run: npm run test:coverage

- uses: actions/setup-node@v4
  with:
    node-version: 22
    cache: 'npm'  # Built-in caching

# Or manual caching for more control
- uses: actions/cache@v4
  with:
    path: |
      ~/.npm
      node_modules
    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
    restore-keys: |
      ${{ runner.os }}-node-

- uses: docker/build-push-action@v6
  with:
    push: true
    tags: my-app:${{ github.sha }}
    cache-from: type=gha
    cache-to: type=gha,mode=max

# .github/workflows/reusable-test.yml
name: Reusable Test
on:
  workflow_call:
    inputs:
      node-version:
        type: string
        default: '22'
    secrets:
      NPM_TOKEN:
        required: false

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ inputs.node-version }}
      - run: npm ci
      - run: npm test

# .github/workflows/ci.yml
jobs:
  test:
    uses: ./.github/workflows/reusable-test.yml
    with:
      node-version: '22'
    secrets: inherit

jobs:
  deploy-staging:
    runs-on: ubuntu-latest
    environment: staging
    steps:
      - run: echo "Deploying to staging"

  deploy-production:
    needs: deploy-staging
    runs-on: ubuntu-latest
    environment:
      name: production
      url: https://myapp.com
    steps:
      - run: echo "Deploying to production"

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm ci && npm run build
      - uses: actions/upload-artifact@v4
        with:
          name: build-output
          path: dist/
          retention-days: 7

  deploy:
    needs: build
    runs-on: ubuntu-latest
    steps:
      - uses: actions/download-artifact@v4
        with:
          name: build-output
          path: dist/
      - run: npx vercel deploy dist/ --prod

jobs:
  lint:
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - run: npm run lint

  deploy:
    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
    runs-on: ubuntu-latest
    steps:
      - run: ./deploy.sh

  release:
    if: startsWith(github.ref, 'refs/tags/v')
    runs-on: ubuntu-latest
    steps:
      - run: ./release.sh

concurrency:
  group: deploy-${{ github.ref }}
  cancel-in-progress: true  # Cancel previous run for same branch

# .github/actions/setup-project/action.yml
name: Setup Project
description: Install dependencies and build
inputs:
  node-version:
    default: '22'
runs:
  using: composite
  steps:
    - uses: actions/setup-node@v4
      with:
        node-version: ${{ inputs.node-version }}
        cache: npm
    - run: npm ci
      shell: bash
    - run: npm run build
      shell: bash

steps:
  - uses: actions/checkout@v4
  - uses: ./.github/actions/setup-project
    with:
      node-version: '22'
  - run: npm test

on:
  push:
    paths:
      - 'apps/web/**'
      - 'packages/shared/**'
      - 'package.json'
    paths-ignore:
      - '**.md'
      - '.github/ISSUE_TEMPLATE/**'

jobs:
  build:
    runs-on: [self-hosted, linux, x64, gpu]
    steps:
      - uses: actions/checkout@v4
      - run: nvidia-smi  # GPU available!
      - run: python train.py

name: CI/CD
on:
  push:
    branches: [main]
  pull_request:

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

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: ./.github/actions/setup-project
      - run: npm run lint
      - run: npm run typecheck

  test:
    needs: lint
    uses: ./.github/workflows/reusable-test.yml
    secrets: inherit

  build:
    needs: test
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: ./.github/actions/setup-project
      - run: npm run build
      - uses: actions/upload-artifact@v4
        with:
          name: build
          path: dist/

  deploy:
    if: github.ref == 'refs/heads/main'
    needs: build
    runs-on: ubuntu-latest
    environment: production
    steps:
      - uses: actions/download-artifact@v4
        with:
          name: build
      - run: ./deploy.sh