title: Is it possible to set an environment variable in Cucumber?
body: <p>I am building a web application that has a whitelabel option.</p>
  
  <p>The whitelabel option offers all of the same functionality of the core website but is based off a different domain. When on that domain, a number of different templates and rules are applied to the site to account for the whitelabel features.</p>
  
  <p>I would like to run almost all of my features on both the core domain and the whitelabel domain. How can I set an environment variable in Cucumber (ideally via the command line) so that I can rerun these critical tests based off the new domain?</p>