add gaming specialisation

hosts/nb-01.cloonar.com/modules/nvidia.nix

@@ -28,4 +28,15 @@
 		amdgpuBusId = "PCI:193:0:0";
 		nvidiaBusId = "PCI:100:0:0";
 	};
+
+  specialisation = {
+    gamind.configuration = {
+      system.nixos.tags = [ "gaming" ];
+      hardware.nvidia = {
+        prime.offload.enable = lib.mkForce false;
+        prime.offload.enableOffloadCmd = lib.mkForce false;
+        prime.sync.enable = lib.mkForce true;
+      };
+    };
+  };
 }