code: public function actionPackage(array $what)
      {
          $this->validateWhat($what, ['app']);
          $versions = $this->getCurrentVersions($what);
  
          $this->stdout("You are about to generate packages for the following things:\n\n");
          foreach ($what as $ext) {
              if (strncmp('app-', $ext, 4) === 0) {
                  $this->stdout(' - ');
                  $this->stdout(substr($ext, 4), Console::FG_RED);
                  $this->stdout(' application version ');
              } elseif ($ext === 'framework') {
                  $this->stdout(' - Yii Framework version ');
              } else {
                  $this->stdout(' - ');
                  $this->stdout($ext, Console::FG_RED);
                  $this->stdout(' extension version ');
              }
              $this->stdout($versions[$ext], Console::BOLD);
              $this->stdout("\n");
          }
          $this->stdout("\n");
  
          $packagePath = "{$this->basePath}/packages";
          $this->stdout("Packages will be stored in $packagePath\n\n");
  
          if (!$this->confirm('Continue?', false)) {
              $this->stdout("Canceled.\n");
              return 1;
          }
  
          foreach ($what as $ext) {
              if ($ext === 'framework') {
                  throw new Exception('Can not package framework.');
              } elseif (strncmp('app-', $ext, 4) === 0) {
                  $this->packageApplication(substr($ext, 4), $versions[$ext], $packagePath);
              } else {
                  throw new Exception('Can not package extension.');
              }
          }
  
          $this->stdout("\ndone. verify the versions composer installed above and push it to github!\n\n");
  
          return 0;
      }
docs: This will generate application packages for download page.
  
  Usage:
  
  ```
  ./build/build release/package app-basic
  ```
  
  @param array $what what do you want to package? this can either be:
  
  - an application indicated by prefix `app-`, e.g. `app-basic`,
  
  @return int