Change unprivileged user uid for container

[sevmonster]

Is your feature request related to a problem? Please describe. My first user uids begin at 1000, as is the case in many Linux environments. It would be nice to have the ability to set the uid to run as with environment variables for the Docker or Kubernetes container. This would likely necessitate automatically adjusting the internal user uid (and removing other lower numbered uids that might conflict). Projects like Paperless allow this kind of functionality.

Describe the solution you'd like A new config variable that changes the uid/gid authentik drops privs to.