title: Jenkins - before build email trigger with build_user_id
body: <p>Using <em>Jenkins 2.277.2</em> (LTS) and <em>Extended E-mail Notification</em> and <em>build user vars</em> plugins I'm trying to send emails <strong>before</strong> build to notify build-user that job is started and also after success/fail.</p>
  <p>Problem is that I need to use <code>${BUILD_USER_ID}</code> variable and it does not get exposed for <em>Before Build</em> trigger. For any other triggers that I tested (<em>always</em>, <em>failure - any</em>, <em>success</em>) it is exposed correctly, however all of those emails are being sent after the build, and I need to notify build-user that job is started.</p>
  <p>Any ideas how to achieve that? Ideally without any more plugins installation, but if there's no way - that's kind of acceptable too.
  Thanks.</p>
  <p><strong>upd</strong> It'd probably be easier for me to illustrate what I meant - here's how it looks <a href="https://i.imgur.com/YdG1N9C.png" rel="nofollow noreferrer">https://i.imgur.com/YdG1N9C.png</a></p>