add misc releases support in API

spec/controllers/api/sync_controller_spec.rb

@@ -110,6 +110,16 @@ RSpec.describe Api::SyncController, type: :controller do
       expect(guardian_photo).to include('id', 'type', 'attributes')
       expect(photo_attributes).to include('filename', 'content_type', 'url', 'thumbnail_url')
     end
+
+    it 'contains misc releases' do
+      create_default_data
+
+      get :index
+
+      misc_releases = attributes_for_type('misc_releases')
+
+      expect(misc_releases.first).to include('id')
+    end
   end
 
   private
@@ -120,6 +130,7 @@ RSpec.describe Api::SyncController, type: :controller do
     create(:talent_release, project: project)
     create(:location_release, project: project)
     create(:material_release, project: project)
+    create(:misc_release, project: project)
   end
 
   def create_default_data_with_guardian_info