title: How to exclude files from a Jenkins pipeline "scm checkout" step?
body: <p>In a Jenkins multibranch pipeline, I'd like to exclude some folders from a SVN checkout, that are not useful for the build.</p>
  
  <p>I currently use the following:</p>
  
  <pre class="lang-groovy prettyprint-override"><code>stage('Checkout') {
      checkout scm
  }
  </code></pre>
  
  <p>We can add parameters to the "checkout scm" step but I can't find how to specify SVN exclusion pattern?</p>