title: How to set fastlane credentials
body: <p>I would like to set environmental variables i.e username using a command I tried </p>
  
  <pre><code>fastlane fastlane-credentials add --username me@myappleaccount.com
  </code></pre>
  
  <p>but I still get a prompt :</p>
  
  <pre><code>[10:30:31]: To not be asked about this value, you can specify it using 'username'
  Your Apple ID Username: 
  </code></pre>
  
  <p>I work in a team of developers and I would like to have an ability to for every developer to set there own username without committing the files with different username. Is there a command for that.</p>