Provide aarch64 musl builds

[alex]

Thanks for this repo! Currently there's x86-64 musl builds, but not aarch64 ones. It'd be very useful if there were aarch64-musl builds available. Thanks!

[wojiushixiaobai]

• Riscv64 native #157

[mollux]

@alex I created a PR for aarch64 musl builds, see #189

[sxa]

Closing as this is complete and the builds are being published regulary.