Generate binary for aarch64-unknown-linux-gnu

[SergioGasquez]

Add CI to generate binary package of ldproxy for aarch64-unknown-linux-gnu. This is very useful for devcontainers in ARM chips.

[SergioGasquez]

Could we generate a release or rerun the release workflow so we get binaries for ldproxy in aarch64-unknown-linux-gnu, this would help our CI of generating Dockerhub images in rust-build

[N3xed]

@SergioGasquez
So, I bumped the ldproxy version to 0.3.2 (with a crates.io release) and created a github release, that should now contain all the release artifacts.

(Sorry for the noise with recreating the 0.3.1 ldproxy release, I didn't realize this would not pick up the new workflow.)

[SergioGasquez]

Thanks for generating 0.3.2 release @N3xed!