Add server rules (#15769)

app/serializers/rest/instance_serializer.rb

@@ -9,7 +9,9 @@ class REST::InstanceSerializer < ActiveModel::Serializer
 
   has_one :contact_account, serializer: REST::AccountSerializer
 
-  delegate :contact_account, to: :instance_presenter
+  has_many :rules, serializer: REST::RuleSerializer
+
+  delegate :contact_account, :rules, to: :instance_presenter
 
   def uri
     Rails.configuration.x.local_domain

app/serializers/rest/rule_serializer.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class REST::RuleSerializer < ActiveModel::Serializer
+  attributes :id, :text
+
+  def id
+    object.id.to_s
+  end
+end