@Override
  public String getCpuArch() {
    return System.getProperty("os.arch");
  }
This function will sign an android app and add it to the App Store. The function is made public because it also be
invoked by the Folder Monitor each time a new application dropped into this folder.

@param file
         - The file to be added to the app store
@throws AndroidSdkException
selendroid-standalone/src/main/java/io/selendroid/standalone/server/model/SelendroidStandaloneDriver.java