Installing cargo-udeps takes very long in the CI

[tertsdiepraam]

The CI builds cargo-udeps from source every time for all 3 platforms for which we test it. This can take up to 20 minutes (see for example https://github.com/uutils/coreutils/runs/4843132122?check_suite_focus=true). The output of the CI says:

Tool cache is disabled in the Action inputs, skipping it
Falling back to the `cargo install` command

Maybe we could enable that tool cache to speed this up a bit?

[tertsdiepraam]

To be fair, in other PR's it seems to take 7-11 minutes. But I feel like that's still quite long, especially because it blocks all the build steps.

[sylvestre]

hmm, it should not block the builds?!
are you sure?

[tertsdiepraam]

Oh I guess that's just an artifact of multiple PRs fighting for CI time at the moment then.

[sylvestre]

maybe we can change the priority in GH action?!

[rivy]

I disabled the tool cache use (back in aba1c8f) because of errors and a languishing issue to repair them.

It looks like fixing the problem is still not on the near-term agenda.

In the meanwhile, I probably could create a repository with compiled tools to act as a cache, downloading a prefab version of cargo-udeps from that repo. It would likely shave 5 mins (maybe a bit more) off of all the Style/deps CI steps.

[tertsdiepraam]

Hmm, that seems a bit too complicated for what it would gain us. If there isn't really a simple solution I'll just close this issue. Thanks for the reply!