Hi guys!
Glad to be here!!

to run any gui app inside of podman container you will need to authorize the display first.

$ xhost +"local:podman@" #<- normal user

after this create your normal podman container and execute

Dockerfile:
FROM ubuntu
RUN apt-get update && apt-get install x11-apps -y
CMD ["/usr/bin/xclock"]

podman build -t gui . # << to create the image

and

podman run -it -e DISPLAY --rm --net=host --name="namehere" gui # <- to launch

Hope the developers change in future this permission to access display from user to another way like the file system":z" and I really think SELinux need to block this access too,

Some comments from big sharks?

)