instruction: Create a Kubernetes configuration for example: deploying php guestbook application with redis | kubernetes
output: ```yaml
  # SOURCE: https://cloud.google.com/kubernetes-engine/docs/tutorials/guestbook
  apiVersion: apps/v1
  kind: Deployment
  metadata:
   name: redis-leader
   labels:
   app: redis
   role: leader
   tier: backend
  spec:
   replicas: 1
   selector:
   matchLabels:
   app: redis
   template:
   metadata:
   labels:
   app: redis
   role: leader
   tier: backend
   spec:
   containers:
   - name: leader
   image: "docker.io/redis:6.0.5"
   resources:
   requests:
   cpu: 100m
   memory: 100Mi
   ports:
   - containerPort: 6379
  ```