feat: add musl target support in npm pakcage

[matteosacchetto]

Summary

In this PR i am adding support for the linux musl target in the npm package @biomejs/biome.
The idea of adding this feature was initially introduced in discussion #946, since from version 1.40 biome is now built also for the linux musl target thanks to PR #821.

In this PR i am modifying the following files:

• generate-packages.mjs: to add the generation of the packages also for linux-musl and add libc field to package.json (reference issue: Support libc field in package.json pnpm/pnpm#4454)
• postinstall.js: to identify if on linux-musl and select the correct package
  • the isMusl function was implemented as suggested in Add `musl` detection in `postinstall.js` #946 following the implementation of detect if we are installing musl or gnu target microsoft/vscode-ripgrep#25, with the only difference that I used the sync version of exec.
• biome/bin/biome: add linux-musl detection

Minore issue, though I do not know if it is solvable, on linux with npm it will install both @biomejs/cli-linux-${arch} and @biomejs/cli-linux-${arch}-musl, since npm will install based on arch and platform (which is linux for both packages).

Test Plan

I tested the isMusl() function on both linux and alpine to check it was working properly.
I checked that getName() was returning the correct names for the various platforms and arch.

I tested locally, by running npm pack and installing them locally and on alpine, the correct musl target is run.
Tested also with bun on alpine, and with pnpm.

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[ematipico]

Minore issue, though I do not know if it is solvable, on linux with npm it will install both @biomejs/cli-linux-${arch} and @biomejs/cli-linux-${arch}-musl, since npm will install based on arch and platform (which is linux for both packages).

This is something we could add to our documentation, what do you think? Maybe here: https://biomejs.dev/guides/manual-installation/#supported-platforms

[ematipico]

That's awesome @matteosacchetto, thank you so much for this contribution! 🙏

[matteosacchetto]

Minore issue, though I do not know if it is solvable, on linux with npm it will install both @biomejs/cli-linux-${arch} and @biomejs/cli-linux-${arch}-musl, since npm will install based on arch and platform (which is linux for both packages).

This is something we could add to our documentation, what do you think? Maybe here: https://biomejs.dev/guides/manual-installation/#supported-platforms

I agree that it should be something to mention, though I do not know where we could mention it.
I feel like the "manual installation" section is not 100% the correct place, since it is something related to when it is installed with NPM

[ematipico]

We could add a new heading ### after the installation instructions: https://biomejs.dev/guides/getting-started/#installation

[ematipico]

Going to merge this, we can write the documentation in a different PR :D