add rollback to gitea jenkinsfile

dockerfiles/services/gitea/Jenkinsfile

@@ -52,7 +52,7 @@ pipeline {
                     dir(WORKDIR) {
                         sh """
                             export DOCKER_HOST=${DOCKER_HOST}
-                            docker service rollback gitea
+                            docker service rollback gitea_app
                         """
                     }
                 }