Dockerfile Best Practices

Create an optimized Dockerfile for [APPLICATION TYPE].

Language/Runtime: [NODE/PYTHON/GO/JAVA]
App type: [WEB SERVER/WORKER/CLI]
Environment: [DEVELOPMENT/PRODUCTION]

Apply:
- Multi-stage build to minimize image size
- Non-root user for security
- Layer caching optimization
- .dockerignore file
- Health check instruction
- Environment variable handling
- Signal handling for graceful shutdown

Include docker-compose.yml for local development.