chore(ci): add gh token for setup-rust

[Jayllyz]

Summary

Installing the toolchain can take a long time in macOS because of this issue : moonrepo/setup-rust#22

ex workflows where this happens:
https://github.com/biomejs/biome/actions/runs/10872714495/job/30168050791

Test Plan

Should work.

[nhedger]

That's a good idea. Can you add the env only to the relevant steps? Adding it at the workflow level makes the secret available to all steps, even those that don't need it.

[nhedger]

Thanks!