Fat static binaries with Rust

The following steps were required on a Linux system to build a fat, static binary with Rust.

1. Add rust toolchain with musl

$ rustup target add x86_64-unknown-linux-musl

2. Build the application by providing the above musl target

$ cargo build --target=x86_64-unknown-linux-musl

3. Verify build output

$  file target/x86_64-unknown-linux-musl/debug/<app>
target/x86_64-unknown-linux-musl/debug/<app>: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=071b24021cc31a5f6f136c5148f69c163bbd1733, not stripped
$ ldd target/x86_64-unknown-linux-musl/debug/<app>
        not a dynamic executable