How do I get a WSL compatible tar file out of a existing flake-enabled NixOS configuration?

[volkswagenfeature]

So I'm trying to port over my configs from my laptop to a WSL environment. You can see my up-to-date laptop config here or my attempt to make WSL work here. I'm still learning Nix, so I'm not sure how to call your code from my own.

If you'll pardon the broad question, What modifcations need to be made to a flake.nix to let me produce a tarball of the whole system, with all the stuff I added included? I did get a successful build by adding NixOS-WSL to my flake inputs, and adding the line defaultPackage."${system}" = inputs.NixOS-WSL.nixosConfigurations.mysystem.config.system.build.installer; but as you might have expected, this only spits back the "empty", default environment.

[nzbr]

You can take a look at configuration.nix and copy the wsl block from there. Then, just add inputs.NixOS-WSL.nixosModules.wsl to your configuration's imports. After that, you should be able to build the config.system.build.installer of the configuration