instanciar JekyllService para cada sitio

app/lib/active_storage/service/registry_decorator.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module ActiveStorage
+  module Service
+    # Modificaciones a ActiveStorage::Service::Registry
+    module RegistryDecorator
+      extend ActiveSupport::Concern
+
+      included do
+        # El mismo comportamiento que #fetch con el agregado de generar
+        # un {JekyllService} para cada sitio.
+        def fetch(name)
+          services.fetch(name.to_sym) do |key|
+            if configurations.include?(key)
+              services[key] = configurator.build(key)
+            elsif (site = Site.find_by_name(key))
+              root = File.join(site.path, 'public')
+              services[key] = ActiveStorage::Service::JekyllService.new(root: root, public: true).tap do |s|
+                s.name = key.to_sym
+              end
+            elsif block_given?
+              yield key
+            else
+              raise KeyError, "Missing configuration for the #{key} Active Storage service. " \
+                              "Configurations available for the #{configurations.keys.to_sentence} services."
+            end
+          end
+        end
+      end
+    end
+  end
+end
+
+ActiveStorage::Service::Registry.include ActiveStorage::Service::RegistryDecorator