Switch jenkins scm trigger from poll to webhook

gistfile1.txt

import hudson.model.*
import hudson.triggers.*
import com.cloudbees.jenkins.*
 
 
TriggerDescriptor SCM_TRIGGER_DESCRIPTOR = Hudson.instance.getDescriptorOrDie(SCMTrigger.class)
assert SCM_TRIGGER_DESCRIPTOR != null;
 
for(item in Hudson.instance.items)
{
  println("Working on project <$item.name>")
   
  def trigger = item.getTriggers().get(SCM_TRIGGER_DESCRIPTOR)
  if( trigger != null && trigger instanceof SCMTrigger && !(trigger instanceof GitHubPushTrigger))
  {
	println("> $trigger.spec")
    println(SCM_TRIGGER_DESCRIPTOR.id)
         
    def newTrigger = new GitHubPushTrigger()
    newTrigger.job = item

    item.removeTrigger(SCM_TRIGGER_DESCRIPTOR)
    item.addTrigger(newTrigger)
    
  }
  else
  {
    println "> Nothing to do"
  }
}