class ActiveStorage::Service

:nodoc:
See MirrorService for an example.

Passes the configurator and all of the service's config as keyword args.

need to build additional services using the configurator.
Override in subclasses that stitch together multiple services and hence

def build(configurator:, name:, service: nil, **service_config) #:nodoc:
  new(**service_config).tap do |service_instance|
    service_instance.name = name
  end
end