title: Is it possible to map a user inside the docker container to an outside user?
body: <p>I know that one can use the <code>--user</code> option with Docker to run a container as a certain user, but in my case, my Docker image has a user inside it, let us call that user <code>manager</code>. Now is it possible to map that user to a user on host? For example, if there is a user <code>john</code> on the host, can we map <code>john</code> to <code>manager</code>?</p>