Add official docker support

[ReenigneArcher]

Describe the Bug

Currently the plugin can be used in Docker Plex by downloading the plugin and volume mapping the extracted folder to the appropriate folder inside the Plex container.

Expected Behavior

Provide a Dockerfile and image that allows use of Linuxserver's mod system.

Additional Context

Example of an existing Plex plugin docker-mod: https://github.com/linuxserver/docker-mods/tree/plex-absolute-hama

Documentation on docker-mods: https://github.com/linuxserver/docker-mods