enforce wheel size limits, README formatting in CI

[jameslamb]

Description

Contributes to rapidsai/build-planning#110

Proposes adding 2 types of validation on wheels in CI, to ensure we continue to produce wheels that are suitable for PyPI.

• checks on wheel size (compressed),
  • to be sure they're under PyPI limits
  • and to prompt discussion on PRs that significantly increase wheel sizes
• checks on README formatting
  • to ensure they'll render properly as the PyPI project homepages
  • e.g. like how https://github.com/scikit-learn/scikit-learn/blob/main/README.rst becomes https://pypi.org/project/scikit-learn/

Notes for Reviewers

How I tested this

Initially set the size threshold for libcudf to a value that I knew it'd violate (75MB compressed, when the wheels are 400+ MB compressed).

Saw CI fail as expected, and print a summary with the expected contents.

checking 'final_dist/libcudf_cu11-24.12.0a333-py3-none-manylinux_2_28_aarch64.whl'
----- package inspection summary -----
file size
  * compressed size: 0.4G
  * uncompressed size: 0.6G
  * compression space saving: 34.6%
contents
  * directories: 164
  * files: 1974 (2 compiled)
size by extension
  * .so - 0.6G (97.0%)
  * .h - 6.7M (1.0%)
  * no-extension - 4.8M (0.7%)
  * .cuh - 3.8M (0.6%)
  * .hpp - 2.2M (0.3%)
  * .a - 1.1M (0.2%)
  * .inl - 0.8M (0.1%)
  * .cmake - 0.1M (0.0%)
  * .md - 8.3K (0.0%)
  * .py - 4.0K (0.0%)
  * .pc - 0.2K (0.0%)
  * .txt - 34.0B (0.0%)
largest files
  * (0.6G) libcudf/lib64/libcudf.so
  * (3.3M) libcudf/bin/flatc
  * (1.0M) libcudf/lib64/libflatbuffers.a
  * (0.5M) libcudf/include/libcudf/rapids/libcudacxx/cuda/std/__atomic/functions/cuda_ptx_generated.h
  * (0.2M) libcudf_cu11-24.12.0a333.dist-info/RECORD
------------ check results -----------
1. [distro-too-large-compressed] Compressed size 0.4G is larger than the allowed size (75.0M).
errors found while checking: 1

(build link)

Updated that threshold in python/libcudf/pyproject.toml, and saw the build succeed (but the summary still printed).

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[bdice]

Should this be implemented in https://github.com/rapidsai/gha-tools?

[bdice]

Discussed offline -- maybe we can centralize this in the future. There may be some differences in how paths / current directories are handled across repositories. For now this is not a priority.

[jameslamb]

/merge