Modify the Linux docker run command for systems with 2+ GPUs #334
Description
The docker run command line for Linux in https://github.com/openvinotoolkit/docker_ci/blob/master/docs/accelerators.md>, docker run -it --device /dev/dri --group-add=$(stat -c \"%g\" /dev/dri/render* ) $IMAGE ./samples/cpp/samples_bin/hello_query_device, leads to docker: invalid reference format error.
The reason being stat -c \"%g\" /dev/dri/render* prints more than 1 line of output and the second line of IDs is interpreted as a docker image name.
I suggest the following modification for --group-add to generalize the command line for such cases:
--group-add=$(for g in $(stat -c "%g" /dev/dri/render* | sort -u); do echo $g; done).