Nextjs Deployment

This handles the full production deployment story for Next.js apps: Docker containerization with multi-stage builds, GitHub Actions CI/CD pipelines, environment variable management, health checks, and OpenTelemetry monitoring. The real value is in the standalone output mode configuration and the multi-stage Dockerfile that actually works. One critical detail it gets right is the NEXT_SERVER_ACTIONS_ENCRYPTION_KEY requirement for Server Actions in multi-server deployments, which will save you hours of debugging "Failed to find Server Action" errors. Covers both the happy path setup and the runtime configuration patterns you need when promoting the same Docker image through staging to production.