Use uv pip install on container build

[gerrod3]

Should speed up the CI by 30 secs.

📜 Checklist

• Commits are cleanly separated with meaningful messages (simple features and bug fixes should be squashed to one commit)
• A changelog entry or entries has been added for any significant changes
• Follows the Pulp policy on AI Usage
• (For new features) - User documentation and test coverage has been added

See: Pull Request Walkthrough

[gerrod3]

hmm, there was no speed up compared to past runs. Not sure why, the uv pip install step should be much faster than a normal pip install.

[dralley]

Given github's issues today, I wouldn't take anything as representative