Exposed the snapshot ids of each format

Author: distributive

app/resources/api/v3/public/format_resource.rb

@@ -3,8 +3,8 @@ module V3
     module Public
       class Api::V3::Public::FormatResource < JSONAPI::Resource
         immutable
-        
-        attributes :name, :active_snapshot_id, :updated_at
+
+        attributes :name, :active_snapshot_id, :snapshot_ids, :updated_at
         key_type :string
 
         paginator :none