add channel for checkin process

app/jobs/checkin_job.rb

@@ -0,0 +1,10 @@
+class CheckinJob < ApplicationJob
+  queue_as :default
+
+  def perform()
+  	table = DiningFacility.get_checkin_booking
+    ActionCable.server.broadcast "checkin_channel",table: table
+  end
+
+
+end