fix(google-cloud): catch missing Secret on first run

in getSecret, if /Secret does not exist, we had an async
error uncaught. Catch it explicitly so that the Secret
will get created.

plugins/google-cloud/src/data-storage.ts

@@ -98,6 +98,9 @@ class GoogleCloudDatabase implements IPluginStorage<VerdaccioConfigGoogleStorage
       }
       // "{\"secret\":\"181bc38698078f880564be1e4d7ec107ac8a3b344a924c6d86cea4a84a885ae0\"}"
       return entities.secret;
+    }).catch(err => {
+      this.logger.warn('gcloud: [datastore getSecret] init error');
+      return Promise.reject(getServiceUnavailable('[getSecret] permissions error'));
     });
   }