There's a closed pull request on the void-packages repository

xbps-src: add sccache support
https://github.com/void-linux/void-packages/pull/30702

Description:
This PR adds support for using `sccache` when building `cargo` crates with `xbps-src`, just like `ccache`.
Unfortunately, this PR is blocked by https://github.com/void-linux/void-packages/pull/29756.

Roadmap:
- [ ] Perform some benchmarks of build time speedups and share the results.
- [ ] Test caching crates across different packages.
- [ ] Implement `rust_bootstrap` flag into `xbps-src`, see #30702 (comment)
- [ ] Test parallel builds in different masterdirs, see https://github.com/void-linux/void-packages/pull/30702#issuecomment-833552762