Question about Frigate-LXC Scipt

[albotroz]

when I enter ( ls -lah /dev/dri) in the container I see the following:
crw-rw---- 1 root render 226, 128 Mar 1 11:22 renderD128

How was this achieved?

When I create my own Frigate-LXC privileged container, I constantly have:
crw-rw---- 1 root _ssh 226, 128 Mar 1 11:23 renderD128

It is possible to change the “render” group by changing the rights, but this is reset after restarting proxmox or the Frigate container.

How was this achieved in the script so that it is not reset back to "_ssh"?