title: How to list / echo all variables defined in Azure pipeline?
body: <p>I'm trying to find a way to list all the variables defined in an Azure Devops pipeline. I've found examples using <code>env</code> in a script but that gets <em>all</em> environment variables and any defined in my yaml have their names changed (to upper case and _ instead of .)</p>
  <p>What I'd like is just the variables dictionary output.  I've tried</p>
  <pre class="lang-yaml prettyprint-override"><code>- ${{ each value in variables }}:
    - script: echo ${{ value.key }} ${{value.value}}  
  </code></pre>
  <p>But that makes one CmdLine task for each variable rather than just echoing them all in one task to make it easy to read</p>