rework python build

[loosebazooka]

this doesn't add debian13 support, that will require some work to get builds from somewhere else

[gemini-code-assist]

Summary of Changes

Hello @loosebazooka, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request undertakes a significant refactoring of the Python build system. It extracts the detailed definitions for Python OCI images, image indices, and container structure tests into a dedicated Starlark file, python3/python.bzl. This modularization simplifies the main python3/BUILD file, making it more readable and maintainable by abstracting away the complex rule generation logic into reusable functions. The change also includes an update to how debug Python variants are named within the build configuration.

Highlights

• Refactoring Python Build Logic: The core logic for building Python OCI images and their associated tests has been moved from python3/BUILD into a new Starlark file, python3/python.bzl.
• Modularization: This change significantly cleans up python3/BUILD by replacing verbose rule definitions with calls to helper functions defined in python3/python.bzl, improving readability and maintainability.
• Debug Variant Naming Consistency: The main BUILD file now correctly references python3_debug for debug Python variations, aligning with the new modular structure and naming conventions.

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[gemini-code-assist]

Code Review

This pull request refactors the Python build logic by extracting it into a new python.bzl file, which significantly improves modularity and cleans up the BUILD file. The overall change is a positive step. My review includes suggestions to align the new Starlark code with best practices, such as preferring for loops over list comprehensions for generating rules, and a more critical fix to add missing tests for the newly created debug image variants.

[github-actions]

🌳 🔄 Image Check
This pull request doesn't make any changes to the images. 👍
You can check the details in the report here