title: Deploying postgresql docker with ssl certificate and key with volumes
body: <p>I'm trying to deploy a postgresql container. I'm trying to put ssl certificate and key in the container using volumes, but I can't get the permissions right. The files need to be readable by the container's <code>postgres</code> user, but also have limited permissions(<code>600</code>). </p>
  
  <p>Is it possible using volumes, or will I have to override the Dockerfile for this?</p>
  
  <p>Thanks. </p>