Add uv export in bazel

[maxbartel]

This adds the uv export command to bazel. uv export and uv pip compile have some slightly different behaviors. The main difference comes when using a uv workspace. With uv export you can ignore those packages, which is probably the behavior you want in a monorepo with bazel. The code is very similar to the one from pip compile.

If you are supportive of this change, I will add docs and update the README.

Thanks!

[markelliot]

Trying to map to how one would use this in a Bazel setup — do you run with multiple rules_python pip hubs?

[mgred]

@markelliot we're using such a uv export rule to write all dependencies of a single package from a workspace into a requirements file and later uv pip install them, put them into a zip file and create a lambda layer for AWS.

[aw632]

It would be great to have this in the repo!

[SuperBo]

Hi, I need this feature to keep the same requirement set in uv.lock and requirements.txt

[SuperBo]

Hi @markelliot , do you consider adding this feature to rules_uv?