nix-config/lib/users/nek0.nix

{ ... }:
{
  users.users.nek0 = {
    isNormalUser = true;
    openssh.authorizedKeys.keys = [
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMm4eqwfpRHGyxOWu+VmfqDyYp5+G2+6jiPWdBnakkZh"
    ];
  };
}