Add GNOME as a desktop manager, working with sway

...and wayland

lib/nixos/default.nix

@@ -16,6 +16,7 @@ in inputs.nixpkgs.lib.nixosSystem {
       };
     }
 
+    (import ./modules/gnome.nix)
     (import ./modules/sway.nix { inherit inputs username; })
 
     configuration

lib/nixos/modules/gnome.nix

@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+
+{
+  services.xserver = {
+    desktopManager.gnome.enable = true;
+
+    displayManager.gdm = {
+      enable = true;
+      wayland = true;
+    };
+  };
+
+  environment.systemPackages = with pkgs; [ networkmanagerapplet ];
+}

lib/nixos/modules/sway.nix

@@ -1,17 +1,12 @@
 { inputs, username, ... }:
 { pkgs, ... }: {
-  services = {
-    displayManager = {
-      defaultSession = "sway";
-      sddm.enable = true;
-    };
-  };
+  services.displayManager.defaultSession = "sway";
 
   programs.sway.enable = true;
 
   xdg.portal = {
     enable = true;
-    extraPortals = with pkgs; [ xdg-desktop-portal-gtk xdg-desktop-portal-wlr ];
+    extraPortals = with pkgs; [ xdg-desktop-portal-wlr ];
   };
 
   home-manager.users.${username} = { pkgs, ... }: {