nixos_config/nixos/modules/profiles/server.nix

{ pkgs, ... }:
{
  system.autoUpgrade = {
    allowReboot = true;
    rebootWindow = {
      lower = "03:00";
      upper = "05:00";
    };
  };

  services.openssh = {
    enable = true;
    settings.PermitRootLogin = "no";
  };

  environment.systemPackages = with pkgs; [
    devenv
    direnv
  ];
}