title: Run gulp with an arbitrary gulpfile name (not gulpfile.js)
body: <p>I have one specific task in my gulpfile that is isolated from the other tasks and never needs to run as part of the rest of the build process. I'd like to put it in a separate gulpfile and execute that on its own.</p>
  
  <p>How can I use <code>gulp</code> with a gulpfile that has a custom name?</p>
  
  <p>The <a href="https://github.com/gulpjs/gulp/tree/master/docs/getting-started" rel="nofollow noreferrer">Getting started document</a> posing as Gulp's docs don't seem to mention the CLI. My search attempts for arguments to the <code>gulp</code>, mostly brings up results on how to get the command line arguments into the <code>gulp</code> tasks.</p>
  
  <p>The actual use case is extracting translatable strings in a Docker container, which I don't want to bloat with unnecessary node.js packages.</p>