How to run kubectl in pipeline

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It worked, here my Jenkins-agent-pod.yaml

apiVersion: v1
kind: Pod
metadata:
  labels:
    type: jenkins-agent
spec:
  #securityContext:
  #  runAsUser: 1000
  containers:
  - name: kaniko
    image: gcr.io/kaniko-project/executor:v1.17.0-debug
    command:
      - sleep
    args:
      - 99d
  - name: kubectl
    image: bitnami/kubectl:latest
    command:
      - "/bin/sh"
      - "-c"
      - "sleep 99d"
    tty: true
    securityContext:
      runAsUser: 0
  restartPolicy: Never

My pipeline

pipeline {
  agent {
    kubernetes {
      yamlFile 'Jenkins-agent-pod.yaml'
      }
    }

  environment {
    DOCKERFILE_PATH = 'Dockerfile'
    DOCKER_IMAGE_NAME = 'myrepo/myapp:tag'
  }

  stages {

    stage('Build and Push Docker Image with Kaniko') {
      steps {
      container(name: 'kaniko', shell: '/busybox/sh') {
        withCredentials([file(credentialsId: 'dockerhub', variable: 'DOCKER_CONFIG_JSON')]) {
          withEnv(['PATH+EXTRA=/busybox']) {
            sh '''#!/busybox/sh
              cp $DOCKER_CONFIG_JSON /kaniko/.docker/config.json
              /kaniko/executor --context `pwd` --dockerfile $DOCKERFILE_PATH --destination $DOCKER_IMAGE_NAME
            '''
            }
          }
        }
      }
    }

    stage('Deploy to Kubernetes') {
      steps {
      container(name: 'kubectl', shell: '/bin/sh') {
        withCredentials([file(credentialsId: 'k3s-hq-admin', variable: 'KUBECONFIG')]) {
          sh "echo $KUBECONFIG > /.kube/config"
          sh "kubectl apply -f manifest.yaml"
          }
        }
      }
    }
  }
}