title: how do i build a list of maps in terraform
body: <p>i would like to build a list of maps in terraform. Is there an operation that would let me do that.</p>
  
  <p>eg: i would like to build the structure (from aws_instance.test.*.private_ip)</p>
  
  <pre><code>addresses = [
     {
       address = private_ip-1
     },
     {
       address = private_ip-2
     }
     ...
  ]
  </code></pre>