Hi, first sorry for the late reply.
I have updated the Docker and fixed some errors introduced by steam changes, now should be working perfectly, because I'm using myself the image right now, and I will add some new features and improvements when I have enough time because I'm working and studying, for the guide, just follow the read me, I think that everything it's explained there, if you need further help just post it here and I will try to help, but please be more detailed about where you want help.
Have a nice day
Added auto-install for Alloc Fixes.
Added clean stop for Docker signal?
Updated Linux gsm scripts.