title: How to create a running nifi docker image with a flow
body: <p>I launched a container of apache/nifi, built, and configured a flow.</p>
  <p>I'd like to somehow save that flow off somewhere, so that it can be loaded into a new docker image running Nifi.</p>
  <p>Such that, a 'user' only has to do 'docker run....' and an instance of nifi will be launched, the flow loaded, and started.</p>
  <p>It's not clear to me what files (nar, xml, etc...) need to be made available to the image a user is to run.</p>