title: Fastlane Appfile in GIT? How to retrieve current apple_id?
body: <p>I setup Fastlane for the build automation for my XCode project. At least the Fastfile (containing the build options) should be in GIT, but I would also be happy to have the Appfile (Team Identifiers) also in GIT. The main issue: The Appfile should contain the apple id of me. Sample:</p>
  
  <pre><code>apple_id "myid@gmail.com" # Your Apple email address
  
  # Default team ID
  team_id "AUE7D4LRRX"
  
  for_platform :ios do
   for_lane :production do
      team_id '-' #reset team id
    end
  end
  </code></pre>
  
  <p>Is it somehow possible to dynamically retrieve the apple id from the apple/xcode preferences? In this current solution I would not be able to add this Appfile to GIT since every developer would have it's own version of that file... with a different apple id of course!</p>
  
  <p>Thanks and best regards!</p>