build pixi 0.63.2

[cjdoris]

No description provided.

[cjdoris]

Hello I tried doing a straight upgrade to build the latest pixi but am still hitting the issue of rust running out of disk space.

I don't have the expertise to fix the underlying issue, so I have switched to simply pulling the pre-built binaries from github releases (the official source for pixi binaries). This copies what we do over in micromamba_jll (except that pulls from conda-forge).

Without this, pixi_jll is REALLY out of date so I just need to get it out.

Since the binary tarballs don't include a license file, I also clone the repo at the same version and take the license from there.

[fingolfin]

Did you try what was suggested in #10590 and change where CARGO_HOME points to?

[cjdoris]

No but from this comment it sounded like the actual solution would be more complicated.

In particular, I don't know where CARGO_HOME should point. And if I did I don't know where it should be set - I don't think doing it in a build script is correct, it should go in BinaryBuilder or something, not sure? And I don't know how I would test this. And I didn't really understand what the second bullet point about cargo_dir was getting at.

I'm happy to have a go if you (or @giordano) could provide a bit more info. But I suspect I will be one of those things that will take me a long time to figure out and 5 mins for you.