Fix backup tests

lib/backup/manager.rb

@@ -153,7 +153,7 @@ module Backup
     end
     def folders_to_backup
-      folders = %w{repositories db uploads}
+      folders = %w{repositories db uploads builds}
       if ENV["SKIP"]
         return folders.reject{ |folder| ENV["SKIP"].include?(folder) }

spec/support/setup_builds_storage.rb

 RSpec.configure do |config|
   def builds_path
-    Rails.root.join('tmp/builds_test')
+    Rails.root.join('tmp/builds')
   end
   config.before(:each) do
     FileUtils.mkdir_p(builds_path)
+    FileUtils.touch(File.join(builds_path, ".gitkeep"))
     Settings.gitlab_ci['builds_path'] = builds_path
   end

spec/tasks/gitlab/backup_rake_spec.rb

@@ -16,7 +16,7 @@ describe 'gitlab:app namespace rake task' do
   end
   def reenable_backup_sub_tasks
-    %w{db repo uploads}.each do |subtask|
+    %w{db repo uploads builds}.each do |subtask|
       Rake::Task["gitlab:backup:#{subtask}:create"].reenable
     end
   end
@@ -160,7 +160,7 @@ describe 'gitlab:app namespace rake task' do
     it "does not contain skipped item" do
       tar_contents, exit_status = Gitlab::Popen.popen(
-        %W{tar -tvf #{@backup_tar} db uploads repositories}
+        %W{tar -tvf #{@backup_tar} db uploads repositories builds}
       )
       expect(tar_contents).to match('db/')