Issues with Docker Compose Instructions

[theamazingnorad]

Description

As a dual AMD GPU user on Arch under KDE 6.0, I struggled to get this working. Three things I would recommend adding to the instructions.

• The default port information is misleading. The example .env uses 58083 yet the install guide references 8083.
• I had to go into 70-configure_xorg.sh to figure out why my x server was not running -- I was getting errors about Xauthority, but traced it down to not having a valid display device. I'm not sure what the DISPLAY variable of 55 is trying to do, but I ended up adding FORCE_X11_DUMMY_CONFIG=TRUE to my environmental variables to get Xorg in the container to create a dummy display and start.
• You have a commented out line in docker-compose to pass /dev/dri. I'd suggest adding a blurb that, for multiple AMD GPU users, you need to pass the specific GPU you want. So for me, /dev/dri/card1 and /dev/dri/renderD128. At that point, only my AMD 6500 passes and not my 6950XT. Confirmed working with vkvube from the container. I was having issues with it trying to run things on the wrong GPU which was already bound to Wayland in my host.

Anyways, these edits allowed me to get this working. My wife can now game off my 6500 in the container from her Mac while I play off my 6950XT. Hurray 5950X and 64 GB ram :)