➜  nix_images cat custom-iso.nix
{config, pkgs, ...}:
{
	imports = [
		<nixpkgs/nixos/modules/installer/cd-dvd/iso-image.nix>
	];
	isoImage.makeEfiBootable = true;
}
➜  nix_images nix-build '<nixpkgs/nixos>' -A config.system.build.isoImage -I nixos-config=custom-iso.nix