nixos: enable nvidia in distrobox container using Nvidia Container Toolkit

What worked for me on nixos with docker (check nixos wiki on Nvidia, [here](https://nixos.wiki/wiki/Nvidia#NVIDIA_Docker_not_Working) and Nvidia Container Toolkit) was: `distrobox create -i archlinux -n archbox --additional-flags "--device=nvidia.com/gpu=all"`. Then in the distrobox container you can check if nvidia is detected, using for example glxinfo. It should show: ``` name of display: :0.0 display: :0 screen: 0 direct rendering: Yes server glx vendor string: NVIDIA Corporation server glx version string: 1.4 server glx extensions: ``` In nixos config I had: ``` hardware.nvidia-container-toolkit.enable = true; virtualisation.docker.daemon.settings.features.cdi = true; ```