CI: `musllinux` job broken on `main` branch

[phil-opp]

Describe the bug

All the musllinux jobs fail on CI on the main branch. The error message is:

 💥 maturin failed
  Caused by: Failed to run rustc to get the host target
  Caused by: error from command -- stderr:

sccache: error: failed to execute compile
sccache: caused by: Compiler not supported: "error: toolchain \'stable-x86_64-unknown-linux-gnu\' is not installed\nhelp: run `rustup toolchain install stable-x86_64-unknown-linux-gnu` to install it\n"

The first CI run that showed this error was https://github.com/dora-rs/dora/actions/runs/14432894203/job/40469831950 , but I don't think that it's related to the crossbeam-channel dependency update.

[haixuanTao]

Seems to be a sccache issue.

Easiest might be to disable it

[phil-opp]

Thanks! I tried this in #901 and it seems to fix the error: https://github.com/dora-rs/dora/actions/runs/14497133129/job/40667600070?pr=901

[github-actions[bot]]

@haixuanTao has been automatically unassigned from this stale issue after 2 weeks of inactivity.

[haixuanTao]

This should be fixed as of #1000