Optimize docker builds

[hubcio]

Aim of this task is to optimize iggy CI in context of performance of docker image.

Possible improvements:

• hugepages support (if possible, need to do research)
• switch to gnu instead of musl

Related QoL:

• add gnu AND musl artifacts to release artifacts

[0xg0nz0]

Given the large # of dependencies, would it be worth adding using cargo-chef? This will speed up builds.

https://www.lpalmieri.com/posts/fast-rust-docker-builds

[rupurt]

There's a bunch of things we could do with builds using the Nix flake I submitted in #997

For example https://determinate.systems/posts/magic-nix-cache/