nixbox VS miniguest

I am learning NixOS, and its packaging system and I would say the learning curve is steep. My work is based on this repo https://github.com/nix-community/nixbox. I want to install some common development environments such as golang, rust, zig. I see that it provides a place holder to add my custom configurations. How should I go about adding configuration for above tooling. I just need a single example that i can follow. For example how to pull the packages, I to configure directories, and environment variables etc. Thank you in advance for any help.

I got a hook like that working recently, but it was with devshell.

Not all containers are Docker. Docker containers are so-called application containers with no init daemon. NixOS modules rely on an init daemon (systemd) to start services, so if you're looking at NixOS, trying to contort it into an application container might not be the easiest way to go about this. There's also no official NixOS docker template. (There's a Nix package manager one but I don't think that's what you want, I don't think it has systemd) What I'm suggesting is more of a LXC-style operating system container that starts NixOS at stage 2. As for how to go about it, This article presents a straight-forward looking solution. Alternatively, you could have the guest share the host's nix-store with miniguest (shameless self-promotion)