ci(capi): Add MUSL Support + SHA256 checksums

[ptondereau]

• Add MUSL target
• Add SHA256 checksums
• rename release files to biscuit-auth-capi-X.X.X-arch.tar.gz
• download directly cargo-c instead of compiling
• Re-activate macos x86 build

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #239 will not alter performance

_{Comparing ptondereau:capi-release-update (9f35b7e) with main (6ccb7aa)}

Summary

✅ 12 untouched benchmarks

[Geal]

@ptondereau it looks like it will work. Do you feel there's anything to add?

[ptondereau]

@ptondereau it looks like it will work. Do you feel there's anything to add?

For the moment that's enough to start with I'll try to follow what has been done for the wasm plugin with C API then