loongarch64-linux-musl support

[heiher]

Checklist

• I've looked through the issues and pull requests for similar request
• This feature could be solved with a custom image (optional)

Describe your request

Since 1.81.0, Rust has added loongarch64-unknown-linux-musl as a tier 2 level target.

https://doc.rust-lang.org/nightly/releases.html#version-1810-2024-09-05

Publish a cross image for generating loongarch64-unknown-linux-musl application binaries.

Describe why this would be a good inclusion for cross

Complete the span of available Rust targets more fully, so that Rust application developers can more easily support diverse platforms.