Queue-based worker (#1911)

* test

* test

* worker

* queue by procfile

Procfile

 web: bundle exec puma -C config/puma.rb
-worker: bundle exec good_job start
+worker: bundle exec good_job start --queues="default"
+miceworker: bundle exec good_job start --queues="mice"
+elephantworker: bundle exec good_job start --queues="elephant"
 postdeploy: rails db:migrate && rails db:seed

config/initializers/good_job.rb

@@ -4,7 +4,7 @@ Rails.application.configure do
   # config.good_job.retry_on_unhandled_error = false
   # config.good_job.on_thread_error = -> (exception) { Rails.error.report(exception) }
   # config.good_job.execution_mode = :async
-  config.good_job.queues = 'default,mice:1; default,mice,elephant:1; elephant:1'
+  # config.good_job.queues = 'default,mice:1; default,mice,elephant:1; elephant:1'
   # config.good_job.max_threads = 5
   # config.good_job.poll_interval = 30 # seconds
   # config.good_job.shutdown_timeout = 25 # seconds