Dockerfile Optimizer

Optimize the following Dockerfile for production use:

```dockerfile
{{dockerfile}}
```

**Application type**: {{appType}}
**Base image preference**: {{baseImage}} (alpine/slim/distroless)

Analyze and improve:
1. **Image size**: multi-stage builds, minimize layers, remove build-time dependencies
2. **Build speed**: optimize layer caching, order instructions by change frequency
3. **Security**: run as non-root, remove unnecessary packages, no secrets in layers, use specific tags (not :latest), scan for known CVEs
4. **Best practices**: use COPY over ADD, combine RUN commands, set WORKDIR, use .dockerignore
5. **Health checks**: add HEALTHCHECK instruction
6. **Metadata**: add LABEL instructions (maintainer, version, description)

Show the optimized Dockerfile with comments explaining each change. Include the estimated size reduction.