 the rule hash, so if they change, the rule will be
      re-built and tested as appropriate.
    </p>

    <p>
      NB: It's also possible to set environment variables to be passed globally
      to all rules in <code class="code">.plzconfig</code>. See the
      <a class="copy-link" href="/config.html#build">build</a> section in the
      config documentation for more information.
    </p>
  </section>

  <section class="mt4">
    <h3 class="title-3" id="secrets">
      Secrets
    </h3>

    <p>
      R