improve Jenkinsfile

Author: hors

Jenkinsfile

@@ -728,6 +728,9 @@ pipeline {
                     deleteOldClusters("$CLUSTER_NAME")
                     sh """
                         sudo docker system prune --volumes -af
+                        if [ -f /usr/local/bin/kubectl ]; then
+                            sudo rm -f /usr/local/bin/kubectl
+                        fi
                     """
                 }
                 deleteDir()