title: MultiBranch pipeline github webhook
body: <p>Title pretty much says it all. I've seen these:</p>
  
  <p><a href="https://stackoverflow.com/questions/43314483/how-to-trigger-multibranch-pipeline-build-with-github-webhook">How to trigger Multibranch Pipeline build with github webhook</a><br>
  <a href="https://support.cloudbees.com/hc/en-us/articles/224543927-GitHub-webhook-configuration" rel="nofollow noreferrer">https://support.cloudbees.com/hc/en-us/articles/224543927-GitHub-webhook-configuration</a><br>
  <a href="https://support.cloudbees.com/hc/en-us/articles/115003019232-GitHub-Webhook-Pipeline-Multibranch" rel="nofollow noreferrer">https://support.cloudbees.com/hc/en-us/articles/115003019232-GitHub-Webhook-Pipeline-Multibranch</a></p>
  
  <p>I have a github server setup in jenkins, but cannot choose it in the multibranch source (as one of the links suggests), it asks for credentials but no credentials are in the dropdown.</p>
  
  <p>I've also setup a github webhook, but I dont think it makes any difference</p>