title: Gitlab runner + autoscaling + scaled runner options
body: <p>I'm using gitlab runner with <code>docker+machine</code> executor to fire up autoscaled runners on AWS. I would like to use docker-in-docker setup inside the runners to build containers, but I can't find out how to define the needed <code>[runners.docker]</code> properties for the spawned runners to enable docker usage.</p>
  
  <p>Is it possible to somehow pass some config info to autoscaled runners?</p>