So tests are passing if the bucket name is rails-active storage.
But developers specify their own s3 tests configuration (in my case was
activestorage-test) then this regex fails.
Also the first part is dynamic and based on bucket name and region
* Move service configuration from the Engine to Service
* Delegate configuration mechanics to internal Service::Configurator
* Delegate service building to the concrete Service classes, allowing
them to configure composed services.
* Implement for the Mirror service.
