title: How to add a private external dependency/jar from a gitlab maven repo to a google cloud data flow job
body: <p>Using the filesToStage option, can we add a dependency which is available on a private gitlab maven repository? If so, how can the token be specified in this option which will be needed to access the  dependency from the private repo.</p>
  <p>If it is not possible to use filesToStage option to add a private external dependency to the data flow job then what are the other approaches that can be used to achieve this.</p>