WIP: uv2nix packaging

[Lillecarl]

A bit more verbose 😄

[Lillecarl]

@holmboe This approach uses uv2nix to parse the uv.lock file and pyproject.nix to parse much of pyproject.toml which results in generated Nix derivations.
"I'm not a Python developer" so I don't really care for uv or other package managers that aren't Nix too much but it enables using uv for dependency resolution (finding packages that matches all version constraints) rather than relying on the versions in nixpkgs.

This approach uses "editables" to set up your shell environment to execute your local project so you don't have to build at all to run and also exposes a Nix closure that you can ship to any runtime environment.

MAO the power of Nix is not being a bog-standard uv/cargo "replacement" but being able to fearlessly depend on native libraries and executables with "guarantees".

[Lillecarl]

This file isn't used, it's just a copypasta from phabfive