Use gitlab resque fork. Added rake task to stop all workers

lib/tasks/resque.rake

@@ -1,7 +1,22 @@
 require 'resque/tasks'
 
-task "resque:setup" => :environment do
-  Resque.before_fork = Proc.new { ActiveRecord::Base.establish_connection }
+namespace :resque do
+  task setup: :environment do
+    Resque.before_fork = Proc.new { ActiveRecord::Base.establish_connection }
+  end
+
+  desc "Resque | kill all workers (using -QUIT), god will take care of them"
+  task :stop_workers => :environment do
+    pids = Array.new
+
+    Resque.workers.each do |worker|
+      pids << worker.to_s.split(/:/).second
+    end
+
+    if pids.size > 0
+      system("kill -QUIT #{pids.join(' ')}")
+    end
+  end
 end
 
 desc "Alias for resque:work (To run workers on Heroku)"