[QUESTION] Creating an ISO installer for (almost) air-gapped installations

[jakkunight]

Hello there!

I want to be able to perform a complete NixOS installation from my own machine config.

I was able to generate a live CD installer (following the README.md docs) with all my packages, and even user config, but the nixos-install command refused to install my system because of a poor internet connection. I've also tried the nixos-install --system command and it said that I don´t have a properly set NixOS installation. I read at the NixOS docs that it's possible to create an ISO install image for this kind of situations. If that's true, can you provide me some explanations and examples? I'm quite new at the Nix ecosystem. (I'm using flakes)

[jakkunight]

I also forgot to mention that I want also to include the used flake config into the ISO installer, so I don't have to grab it from my repo.

Thanks in advance for the help!