Add permission fix for dvb devices to docker image?

[soosyboosey]

Could this permission fix be added to the docker image for dvb devices? It's a commit from the linuxserver.io images but the script should theoretically work for this docker image too

(Permission fix) https://github.com/linuxserver/docker-tvheadend/pull/137/files

Currently I have a systemd oneshot service chowning /dev/dvb recursively to the user (it runs as an ExecStartPre action when I start the service for my container) that my podman containers run under (while I am using podman most stuff is interchangeable anyway so it doesn't make a difference really which one you are using), but this would be nice to make sure it works without external intervention for userspace containers