What does this PR do?

In recent commits,uv was introduced. When installing Python viauv python install itdefaults to~/.local/share/uv/python. Since the user context in the base stage of the Dockerfile is root, the default path resolves to/root/.local/share/uv/python. Unfortunately, this directory is not accessible to non-root users in unprivileged containers, e.g.

docker run --rm --entrypoint bash -it --user 1000 ghcr.io/huggingface/text-generation-inference:3.2.3 -c"ls /root/.local/share/uv"ls: cannot access'/root/.local/share/uv': Permission denied

This PR fixes this by explicitly setting theUV_PYTHON_INSTALL_DIR variable to/usr/share/uv which is accessible for non-root users.

Fixes#3082
Fixes#3225

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read thecontributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or theforum? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

@Narsil