[Feature] Add Sidekiq Configuration file for server

[Dakad]

How great would it be if we could just pass a YAML file with a configuration of sidekiq server.

Source: https://github.com/sidekiq/sidekiq/wiki/Advanced-Options#the-sidekiq-configuration-file

[hugopl]

It doesn't hurt, however in the world of docker containers where everything is configured through environment variables config files have less importance, but as I said, it doesn't hurt to have it for feature matching with the Ruby version.