Allow specifying PUID and PGID when running the Docker image

[mikegleasonjr]

Describe what you are trying to accomplish and why in non technical terms
Like all linuxserver.io images, I would like to be able to specify the PGID and the PUID of the Frigate process in the Docker container so the files created by Frigate be owned by these user/group.

Describe the solution you'd like
Allow the env variables PUID/PGID be specified.

Describe alternatives you've considered
Maybe specify the user/group in the Frigate config file?

Additional context
The root folder I am using for files for Frigate uses ACL so I can't just write files as root.

EDIT: Seems like the s6 tool you're using can drop privileges: https://github.com/just-containers/s6-overlay#dropping-privileges

[PeteBa]

I'd like to second this request. My use case is to transcode frigate recordings in-situ from the camera's H265 format to H264 so I can playback via the web-ui. Unfortunately, root ownership and default file permissions make this a bit problematic. Maybe consider including a UMASK env parameter as well if you add PUID and PGID.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mikegleasonjr]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

still relevant...

[blakeblackshear]

Related to #3108