Add uv to the Positron bundle

[marcdotson]

Following a discussion with @austin3dickey on Positron Remote SSH functionality in #8194 and experiencing how seamless {reticulate}'s new py_require() declarations work, I think it would be great to add uv to the Positron bundle.

With uv included, you could:

• Install the latest version of Python with uv if none are detected.
• Start with a uv-installed Python version when setting up Positron using the Remote SSH functionality (it is currently bundled with pyenv and you have to run Interpreter: Discover All Interpreters manually to find another install).
• Like reticulate::py_require(), if a project doesn't have an environment, uv can automatically create and activate one as suggested in python: if a project with dependencies is opened without a venv, create and activate one #6965.

I was skeptical of uv at first, but like Polars, the speed of these Rust-based tools are convincing once you've seen them in action. Plus there's something powerful about having a single tool to replace pyenv, venv, and pip -- especially for people new to Python.

[juliasilge]

For clarity, unless I am very mistaken, we do not bundle pyenv.

I think it's unlikely that we would bundle uv either as a whole, but we have definitely had discussions about providing a "pit of success" experience to get folks to install it quite easily, set up new Python interpreters, etc. I too am a big fan of uv! I'll open an issue with your info here about support for installing uv easily.

[austin3dickey]

@marcdotson I noticed from your Python Language Pack logs in #8194 (reply in thread) that the locator keeps trying to figure out details about /Users/a00714634/.pyenv/versions/3.12.4/bin/python, but there exists no such file. Perhaps it's possible there used to be an interpreter there, and some metadata was cached about it in Positron's state? That's the only mention of pyenv in the logs, so maybe that's the version you're talking about. As Julia said, we don't bundle or install any python interpreters using any managers today.

[marcdotson]

What is installing Python when you first connect to a VM using Remote SSH? Should it be doing that?

[austin3dickey]

No, we have no code that installs Python. What's the file location of the installed Python? Could it be part of the AMI you're using?

[marcdotson]

The Python 3.12.3 install is located at /usr/bin/python3 as well as /bin/python3.

I'm just using the default Ubuntu AMI, Ubuntu Server 24.04 LTS (HVM).

[austin3dickey]

Yes, I believe Python 3.12 is included with that AMI: https://discourse.ubuntu.com/t/ubuntu-24-04-lts-noble-numbat-release-notes/39890#p-99950-toolchain-upgrades