GitHub Actions Workflow Generator

name: 'CI'

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

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: '20'
      - name: Install dependencies
        run: npm install
      - name: Run tests
        run: npm test
      - name: Build
        run: npm run build

Save this as .github/workflows/ci.yml in your repo.