Permit usage of GPUs in docker script

[xrd]

This permits you to use GPUs by running the docker script like:

GPU_FLAGS="--gpus all" ./docker-build/run.sh

If you don't set the GPU_FLAGS it is ignored, and therefore does not affect running docker on the CPU for hosts without a GPU.

[mauwii]

This does unfortunatelly not work on Apple Silicon:

docker: Error response from daemon: could not select device driver "" with capabilities: [[gpu]].

but since the script still works when this flag is not set it should be fine.

[mauwii]

Please also add this flag to the docs, with a short description when to use

[xrd]

This does unfortunatelly not work on Apple Silicon:

docker: Error response from daemon: could not select device driver "" with capabilities: [[gpu]].

but since the script still works when this flag is not set it should be fine.

I wonder if you can use something like --gpus mps and get it to work on Apple Silicon. I can try tomorrow on my M1.

[mauwii]

LGTM - thx for contributing!

[mauwii]

This does unfortunatelly not work on Apple Silicon:
docker: Error response from daemon: could not select device driver "" with capabilities: [[gpu]].
but since the script still works when this flag is not set it should be fine.

I wonder if you can use something like --gpus mps and get it to work on Apple Silicon. I can try tomorrow on my M1.

good Idea, but unfortunatelly not:
invalid argument "mps" for "--gpus" flag: count must be an integer: strconv.Atoi: parsing "mps": invalid syntax