X server installed on host OS (must be with a window manger)
Allow connections to the X server. Either by running xhost + as the user starting the X session on the host OS from cli, or by entering xhost + into the ~/.xsessionrc file as the user starting the X session on the host OS (create the file if it doesn't exist)
Other drivers are probably supported too. If your driver is not listed above, try to run the container without the GFX_DRIVER parameter and report back if it works.