Add musl detection in postinstall.js

[matteosacchetto]

I am very happy that biome now is build also for the musl target.

Though, one thing which is missing is the correct detection of that target in the postinstall script

I think we could use this discussion to keep track of the best way to add musl detection

Here is a discussion which could be helpful as a starting point: nodejs/node#17993

[ematipico]

In case someone is interested, here's how it can be done

microsoft/vscode-ripgrep#25

[Conaclos]

Implemented in #1067