adding container kubectl to make this works

Jenkinsfile

@@ -79,6 +79,7 @@ spec:
 
         stage('Deploy to Kubernetes') {
             steps {
+                container('kubectl') {
                     script {
                         withCredentials([file(credentialsId: "${KUBE_CONFIG_ID}", variable: 'KUBE_CONFIG')]) {
                             writeFile file: 'kubeconfig', text: KUBE_CONFIG
@@ -91,6 +92,7 @@ spec:
                 }
             }
         }
+    }
 
     post {
         always {