k8s部署centos-busybox编排文件

在测试验证K8S容器的时候，经常会使用busybox，下面是k8s部署busybox编排文件，方便参考：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: busybox
  namespace: default
spec:
  selector:
    matchLabels:
      app: busybox
  replicas: 2
  template:
    metadata:
      labels:
        app: busybox
    spec:
      containers:
      - name: busybox
        image: opcache/busybox:v2