I just had the same issue with my GPU node not working. I was able to resolve the issue with Spaceinvader One's video.
In addition to adding --runtime=nvidia to extra parameters, you need to add the following two variables. The section of the video starts right at 14:48 https://youtu.be/U6UMjTlwrxs?t=888
Variables used in the template to add
GPU NVIDIA_VISIBLE_DEVICES value Your gpu id
NVIDIA_DRIVER_CAPABILITIES value
Hopefully this resolves your issues.