Take all configuration settings via env variables (including rules)

[evanrich]

I run this in kubernetes, and have it deployed via a helm chart. In case the database were to ever get corrupted, or for configuring new setups, it would be amazing to have it support reading in things like sonarr/radarr/overseerr settings via env variables. I use an external secrets provider (doppler) so i can easily expose things like radarr api tokens securely. A big bonus would be to also support reading in the rules somehow. since they're yaml, they could be stored via a configmap or secret and exposed to the container as well.