Plex arm support

[ldrrp]

Problem

The current plex container only supports the x86_64 architecture.

Solution

On startup if plex container is active on a different architecture then we need to disable it and log to the user to user a new alternate container for pi support. Same if they try using the arm container on a x86_64 system.

https://hub.docker.com/r/greensheep/plex-server-docker-rpi/

New container app name is: plex-arm

Steps to Reproduce the Problem

1. ./server.bin