title: How to pass a variable or resolver as an argument to a hook in Sceptre?
body: <p>I'm trying to use one of the outputs of my CloudFormation template as a parameter to a !cmd hook - e.g.</p>
  
  <pre><code>hooks:
    after_create:
      - !cmd "echo {{ value of cloudformation output }}"
  </code></pre>
  
  <p>Is there a way to do this?</p>