fix detection

lib/puma/plugin/sidekiq_embed.rb

@@ -39,6 +39,7 @@ Puma::Plugin.create do
       configs = Sidekiq.configure_embed do |config|
         config.logger.level = Logger::INFO
         sidekiq_config = YAML.load_file('config/sidekiq.yml')
+        sidekiq_config['queues'] << 'fields' if ENV['DEMO'] == 'true'
         config.queues = sidekiq_config['queues']
         config.concurrency = ENV.fetch('SIDEKIQ_THREADS', 5).to_i
         config.merge!(sidekiq_config)