Complete CI/CD Pipeline with GitHub Actions for Next.js Applications

Create a complete CI/CD pipeline with GitHub Actions for [PROJECT NAME], a Next.js [VERSION] application deployed on [VERCEL/AWS/DOCKER + VPS].\\\\\\\\n\\\\\\\\n**Context:**\\\\\\\\n- Repository: monorepo [YES/NO]\\\\\\\\n- Branches: main (production), develop (staging), feature/*\\\\\\\\n- Existing tests: [NUMBER] unit, [NUMBER] E2E\\\\\\\\n- Database: [POSTGRESQL/MYSQL] — migrations required\\\\\\\\n- Environment variables: [NUMBER] secrets\\\\\\\\n\\\\\\\\n**Workflow 1 — Pull Request (CI):**\\\\\\\\n\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\\\\\\\\\`yaml\\\\\\\\n# Trigger: push to any branch except main\\\\\\\\n\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\n- Checkout + node_modules cache (pnpm store)\\\\\\\\n- Type checking: \\\\\\\\\\\\\\\\\\\\\\\`tsc --noEmit\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\n- Linting: ESLint + Prettier check\\\\\\\\n- Unit tests: Jest/Vitest with coverage report\\\\\\\\n- E2E tests: Playwright with failure screenshots\\\\\\\\n- Verification build: \\\\\\\\\\\\\\\\\\\\\\\`next build\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\n- Automatic preview deployment (unique URL per PR)\\\\\\\\n- Automatic PR comment with: preview link, coverage %, bundle size diff\\\\\\\\n- Mandatory status checks for merge\\\\\\\\n\\\\\\\\n**Workflow 2 — Merge to main (CD):**\\\\\\\\n\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\\\\\\\\\`yaml\\\\\\\\n# Trigger: push to main\\\\\\\\n\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\n- All CI checks\\\\\\\\n- Database migrations (with automatic rollback on failure)\\\\\\\\n- Optimized production build\\\\\\\\n- Deploy to [ENVIRONMENT]\\\\\\\\n- Post-deploy smoke tests (health check + critical endpoints)\\\\\\\\n- Slack/Discord notification: success or failure\\\\\\\\n- Automatic semantic versioning tag\\\\\\\\n\\\\\\\\n**Workflow 3 — Scheduled (Maintenance):**\\\\\\\\n- Dependabot/Renovate: dependency updates\\\\\\\\n- Weekly security audit (\\\\\\\\\\\\\\\\\\\\\\\`pnpm audit\\\\\\\\\\\\\\\\\\\\\\\`)\\\\\\\\n- Lighthouse CI: performance monitoring\\\\\\\\n- Database backup verification\\\\\\\\n\\\\\\\\n**Advanced Configuration:**\\\\\\\\n- Matrix strategy for testing on Node 18 and 20\\\\\\\\n- Concurrency: cancel previous workflows on the same branch\\\\\\\\n- Docker layer caching (if applicable)\\\\\\\\n- Secrets management: GitHub Environments (staging, production)\\\\\\\\n- Recommended branch protection rules\\\\\\\\n\\\\\\\\nProvide complete, functional YAML files for each workflow.