title: Disable automatic trigger build jenkins multibranch
body: <p>I have a multibranch project in jenkins, and every time I press <code>Scan Repository Now</code> it queue a new build just because</p>
  
  <pre><code>  ‘Jenkinsfile’ found
  Met criteria
  </code></pre>
  
  <p>What I'd like to do is whenever I scan the repository, it only add <code>Pull Request</code> to the project without triggering a build. And also, if I turn on scan repository trigger, periodically if not otherwise run, every time it branch indexing, it also build the pull request even after I turn on <strong>Skip initial build on first branch indexing</strong>.</p>
  
  <p>What I'd like to do is whenever there's a comment 'build' in the pull request, then it builds the branch, so if the pr doesn't contain the comment, it should not build anything.</p>
  
  <p>How can I achieve this?</p>
  
  <p>This is my setup</p>
  
  <p><a href="https://i.stack.imgur.com/HEsaI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HEsaI.png" alt="Pull Request"></a>
  <a href="https://i.stack.imgur.com/9Is8e.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9Is8e.png" alt="No Build"></a></p>
  
  <p>I use <code>Jenkins 2.180</code></p>