I thought this allready, but I doubted
that the application window of pokerth is popping up in Gnome, isn't it ?
Compile pokerTH on Debian 11 doesnt work
For the use of docker with gui apps there are some extra steps to do:
https://www.howtogeek.com/devops/how-to ... container/ - section "Forwarding An X Socket to A Docker Container"
https://www.howtogeek.com/devops/how-to ... container/ - section "Forwarding An X Socket to A Docker Container"