x86_64-unknown-linux-musl
- Change build target from `x86_64-unknown-linux-gnu` to `x86_64-unknown-linux-musl` - Default install `x86_64-unknown-linux-musl` toolchain in setup action - Add `musl-tools` and `build-essential` to system dependencies
* build(deps): shadow_rs * ci(build): build for old glibc * ci: simplify all