Production Deployment and CI/CD

CI/CD (Continuous Integration/Continuous Deployment) automatically runs a project's tests and deploys it whenever code changes — instead of manually running tests and copying files to a server by hand.

# .github/workflows/test.yml
name: Tests
on: [push]
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm install
      - run: npm test
      - run: npm run build

This runs the full test suite and production build automatically on every push — catching a broken change before it ever reaches production.