adds nvtop for all hosts

config/nixos/hardware/mennos-server.nix

@@ -27,6 +27,9 @@
     driSupport32Bit = true;
   };
 
+  # nvtop, a system monitor for GPUs
+  environment.systemPackages = with pkgs; [ nvtopPackages.nvidia ];
+
   # Enable NVIDIA Docker support
   # test with: $ docker run --rm -it --device=nvidia.com/gpu=all ubuntu:latest nvidia-smi
   hardware.nvidia-container-toolkit.enable = true;