drone update, yaml error

.drone.yml

@@ -20,7 +20,7 @@ pipeline:
       OAUTH_CLIENT_SECRET: ""
     commands:
       - mysqladmin --version
-      - while ! mysqladmin ping -h 127.0.0.1 --silent; do : sleep 1 ; done
+      - "while ! mysqladmin ping -h 127.0.0.1 --silent; do : sleep 1 ; done"
 
       - yes | mysqladmin -h 127.0.0.1 create fd3_ftth
       - yes | mysqladmin -h 127.0.0.1 create fd_session