Modify build pagination to use 'paginate' helper

lib/api/builds.rb

@@ -26,10 +26,7 @@ module API
             builds
           end
-        page = (params[:page] || 1).to_i
-        per_page = (params[:per_page] || 30).to_i
-
-        present builds.page(page).per(per_page), with: Entities::Build
+        present paginate(builds), with: Entities::Build
       end
       # Get a specific build of a project

lib/api/helpers.rb

@@ -97,8 +97,10 @@ module API
     end
     def paginate(relation)
-      per_page  = params[:per_page].to_i
-      paginated = relation.page(params[:page]).per(per_page)
+      page = (params[:page] || 1).to_i
+      per_page = (params[:per_page] || 30).to_i
+
+      paginated = relation.page(page).per(per_page)
       add_pagination_headers(paginated, per_page)
       paginated