Add dependency caching to GH Actions for faster CI

[escritorio-gustavo]

Our CI takes quite a while to run, mostly because of the Rust compiler being kinda slow. This PR attempts to remedy that by caching its dependencies. It also runs twice on every commit when we do PR's from within the repo, this PR also fixes that.

I have no idea if it will actually work, but should be worth the shot

[escritorio-gustavo]

Okay, first CI run finished in 2m 30s.

We have a few dead code warnings in our tests, I'll add #![allow(dead_code)] to remove those and trigger CI so we can see if there is a difference

[escritorio-gustavo]

2m 22s... that's disappointing

[escritorio-gustavo]

I think it's not caching because it has to compile both --all-features and --no-default-features. I'll try splitting them up to see if helps, if it doesn't, I'll just close this PR

[escritorio-gustavo]

Oops, running these tests in parallel breaks them due to everyone messing with the same files

[escritorio-gustavo]

Well, I finally got CI to run again

[escritorio-gustavo]

Finally! Got the time down to 1m06s

[escritorio-gustavo]

Finally! Got the time down to 1m06s

The only reason for it to still be this slow is that the --all-features test still takes 40s+ to compile for some reason... still, better than the previous 2m+

[NyxCode]

It also runs twice on every commit when we do PR's from within the repo, this PR also fixes that.

🥳

Great change, super happy to see this!
To keep main clean, it'd be nice if you could squash the commits.

[escritorio-gustavo]

To keep main clean, it'd be nice if you could squash the commits.

Agreed, this has way too many commits for something that really should be simple