Runnig the enviroment headless

[HemaZ]

Hello DeepDrive team,
I'm trying to make the examples run headless inside a docker image.
i've edited the following line in gym_env.py
self.sim_process = Popen(cmd, env={'SDL_VIDEODRIVER':'offscreen', 'SDL_HINT_CUDA_DEVICE':'0'})

but the examples don't run, despite running the simulator as this works fine
SDL_VIDEODRIVER=offscreen SDL_HINT_CUDA_DEVICE=0 ./DeepDrive.sh