title: permission denied when executing the jenkins sh pipeline step
body: <p>I have some trouble with this situation:
  everytime I create a new pipeline job ( entitled "pipeline"), the <code>sh</code> step won't work even with simple command like <code>ls</code> or <code>pwd</code> and it returns this log:</p>
  
  <pre><code>sh: 1: /var/jenkins_home/workspace/pipeline@tmp/durable-34c21b81/script.sh: Permission denied
  </code></pre>
  
  <p>Any suggestions? </p>