If needed, generate a new install ISO:
nix build .#nixosConfigurations.installIso.config.system.build.isoImage
It will be saved in the ./results/iso/ directory.
Boot the install image run ip a
to get the IP address. Then run the install script:
bash install.sh <host> <ip>
bash update.sh <host>
Use to configure home directory of non-NixOS system (e.g. Ubuntu):
nix run nixpkgs#home-manager -- switch --flake ./#<user>