GitHub Actions CI/CD Pipeline Generator

Generate a GitHub Actions CI/CD workflow for the following project: **Project type:** web app **Language/Framework:** Language and framework (e.g., 'TypeScript/Next.js') **Package manager:** npm **Deployment target:** Vercel **Branch strategy:** main + feature branches The workflow should: 1. **Trigger** on push to main and on pull requests 2. **Test** — Run linting, type checking, and test suite 3. **Build** — Production build with caching for faster runs 4. **Docker** — Build and push Docker image (if applicable) 5. **Deploy** — Deploy to Vercel on successful main branch builds 6. **Notifications** — Comment on PR with build status Include: - Proper secrets management (list what secrets are needed) - Caching strategy for dependencies - Matrix testing if multiple Node/Python versions are needed - Concurrency settings to cancel outdated runs - Environment-specific variables (staging vs production) Add comments explaining each step for team members unfamiliar with GitHub Actions.