Summary

On GitLab, cache directories are relative to the project directory:

Both artifacts and caches define their paths relative to the project directory, and can’t link to files outside it.

uv's own GitLab docs also show this pattern.

uv build fails in this scenario due to #19991

The build backend we use does not include the cache directory, so this hard error seems rather unfortunate. Ideally we wouldn't have to disable the cache.

Platform

N/A

Version

0.11.25

Python version

N/A