Add custom UID/GID to the Dockerfile

[BenjaminPrice]

Please allow for setting the UID and GID (and umask, ideally) for the docker container via environment variables.

On my linux server as I cannot overwrite the UID/GID (by setting "user: MyUID:MyGID" in the Docker Compose) without the /publish folder breaking all media is stored as root:root.

[C9Glax]

This has been happening a few times.
For now I can only recommend creating the docker container as your normal user.
E.g. giving the normal user rights to create containers.

[dare2try]

I didn't appreciate how hard this actually is until I looked at the linuxserver.io docker files. After a while I called it quits and just built my own image using your current one as a starting point and replacing the UID and GID with my own.
This exercise made me realize that the releases in GitHub don't match what is in master, at least as of 1.5

[derp90]

I would also love this feature, any new series that I add has root:root and I need to chown them for other apps to be able to read the directory

[MonkeyDrone]

Can't wait for this to be implemented!

[Savanta]

+1