Refactor CI and libamambapy tests (on Unix)

[AntoinePrv]

• Add simple libmambapy test
• Use CMakePresets in CI

[AntoinePrv]

@jonashaag @pavelzw Any idea why I cannot delete that cache? I feel like I read all possible doc and tried all possible combination of secrets / tokens / environment variables / permissions...

[pavelzw]

I've never done this sort of stuff in CI, only with my local PAT 👀

[jonashaag]

Can you give more context please? What exactly are you trying to do that doesn't work? Is it a solution for you to manually delete the cache through GitHub's UI?

[AntoinePrv]

I just want to divide the workflow into build > test-libmamba | test-libmambapy | test-micromamba, but apparently there is no easy way to share data between jobs.

I don't understand how using artifacts is Github's recomended solution: it's very annoying to get a proper key, and it will definitly blow up the storage data, when all you want is to share data for the short lived duration of the workflow 🤷

[jonashaag]

Hmm yeah probably there is not good way to do this in GHA.

[AntoinePrv]

Permission denied, now. How user unfriendly does this have to be 🙄

[AntoinePrv]

@JohanMabille since this also fix a bug related to pytest.skip and that the Unix part is completed, we could merge and continue the windows changes in a follow-up PR.