x11docker: Permission denied

[SebastianMosiej]

Hi,
Following examples in docker build with interactive GUI
Executing x11docker --xephyr --printenv --xoverip --no-auth --display=30
ends with all file modifications with Permission denied like
Could not create lock file in /tmp/.tX30-lock

I added eg. ls -al /tmp and id to check what user (root) is performing changes.
uid=0(root) gid=0 groups=0,44(video),106(render)
touch: cannot touch '/tmp/test_file': Permission denied

OS: Debian Trixie
Docker: v 24.0.5