title: Terraform environment specific variables
body: <p>Anyone know if there's a way to populate variables in Terraform based on what the environment/workspace is? Preferably one that</p>
  
  <ul>
  <li>populates the var namespace (ie not an external data source), </li>
  <li>doesn't require a wrapper 
  
  <ul>
  <li>like <code>tf(){ terraform --var-file=$(get_tf_env).tfvars</code></li>
  </ul></li>
  <li>takes effect by changing a terraform env/workspace, without any additional manual steps (ie steps that aren't triggered by running <code>terraform env</code> )? </li>
  </ul>