Trigger deploy:failed task if deploy-artifact fails

The same is done for deploy by default (common.php recipe)

Author: schmengler

recipe/magento_2_2.php

@@ -56,6 +56,7 @@
     'cleanup',
     'success',
 ]);
+fail('deploy-artifact', 'deploy:failed');
 
 # ---- Deployment Flow
 desc('Deploy project');