backwards: Add tailscale-qs GNOME extension for switching exit nodes

hosts/backwards/modules/tailscale/default.nix

@@ -1,9 +1,25 @@
-{ ... }:
+{ pkgs, ... }:
 {
-  services.tailscale.enable = true;
+  services.tailscale = {
+    enable = true;
+
+    # Required for the GNOME extension to control tailscale without root
+    extraSetFlags = [ "--operator=alex" ];
+  };
 
   networking.firewall = {
     checkReversePath = "loose";
     allowedUDPPorts = [ 41641 ];
   };
+
+  home-manager.users.alex = {
+    programs.gnome-shell = {
+      enable = true;
+
+      extensions = [
+        # Tailscale in the GNOME quick settings, including Mullvad exit nodes
+        { package = pkgs.gnomeExtensions.tailscale-qs; }
+      ];
+    };
+  };
 }