title: How to automatically set the version and build number of a Watchkit app target
body: <p>The version and build number (or version and short version) of a Watchkit app and extension have to be set to the same value as the containing app.</p>
  
  <p>I use environment variables to set the apps version in the <code>Info.plist</code> dynamically at build time. That also works fine for the Watchkit extension, but not for the Watchkit app.</p>
  
  <p>The environment variables I use have to be provided in the plist for the main app and extension without <code>${}</code> (for variable <code>${VERSION}</code> I set <code>VERSION</code>).<br>
  if I do the same for the Watchkit app, it is taking the string itself, not the value. If I provide it with dollar &amp; brackets there is no data in the variable.</p>
  
  <p>Any idea how to set the variables for the Watchkit app?</p>