title: How to add environment variables from the Code in Jenkins?
body: <p>So basically the program requires an env variable which is read this way:</p>
  <pre><code>var a = java.lang.System.getenv('envVariable');
  </code></pre>
  <p>Now as I am using a Jenkins Pipeline, I was looking for a way to supply this env variable in the pipeline, but I didn't find a way. Is there a way to achieve this with Jenkins?</p>