nixos/nordvpn: init module

[different-error]

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.
• Follows the automation/AI policy.

AI disclaimer: I wrote most of the code before Claude, but may have used Claude for feedback.

Other relevant prs: previous module pr, package pr.

I use the following configuration.nix file for building the vm:

{
  pkgs,
  ...
}:

{
  imports = [
    ./hardware-configuration.nix
  ];

  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  networking.firewall.enable = true;
  networking.firewall.checkReversePath = "loose";

  services.xserver.enable = true;
  services.displayManager.gdm.enable = true;
  services.desktopManager.plasma6.enable = true;

  environment.etc.hosts.mode = "0644";

  services.nordvpn = {
    enable = true;
    group = "alice";
  };

  virtualisation.vmVariant = {
    virtualisation = {
      memorySize = 8192;
      cores = 3;
    };
  };
  users.groups.alice = { };
  users.users.alice = {
    isNormalUser = true;
    password = "alice";
    group = "alice";
    extraGroups = [
      "wheel"
      "nordvpn"
    ];
    shell = pkgs.bash;
    home = "/home/alice";
    createHome = true;
    packages = with pkgs; [
      tree
      tmux
      dunst
      libnotify
      socat
      vim
      appimage-run
      firefox
      #nordvpn
    ];
  };
  system.stateVersion = "24.11"; # Did you read the comment?
}

nixos-rebuild build-vm -I nixpkgs=/path/to/nixpkgs -I nixos-config=/path/to/configuration.nix

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