Optimize Dockerfile: Unused build stage

[coderabbitai]

Issue Description

In the multi-stage Dockerfile added in PR #342, the build stage isn't being utilized by the runtime stage.

Current Implementation

• The 'build' stage installs dependencies and copies the full context
• The 'runtime' stage reinstalls dependencies instead of copying from the build stage
• There's no 'COPY --from=build' instruction to use artifacts from the build stage

Recommendation

Either:

1. Remove the unused build stage if not needed, or
2. Optimize the Dockerfile by using the build stage to produce artifacts (e.g., wheels or a virtualenv) that are then copied into the runtime image

Reference

This issue was identified in a code review: #342 (comment)