Context

Describe the background behind the problem.

`pixi` is like `uv` for data science. `pixi` is to `conda` what `uv` is to `venv`. Created by the maintainers of `mamba`, this appears to be a celebrated package management tool. While we are building `conda` packages for our stuff, and this is expected to be trivial, it is worth making sure to see if there is anything missing from a technical perspective.

Definition of done

Manually install pixi, create an environment with pymongo, create a pyarrow table, and do a roundtrip test.