The following one liner can be used to run the bootstrap script directly.
curl -sSL https://raw.githubusercontent.com/ChrisLeinbach/NixOS/refs/heads/main/bootstrap.sh | bash
Otherwise, the bootstrap.sh can be run from the shell of a freshly installed Nix system.
The system can then be rebuilt using nixos-rebuild switch --flake .#$(hostname) assuming the system
hostname is set to one controlled by the flake file.