Documentation changes

1. Fix build command
2. Use the k8s gcr.io repo

Author: Andi Li

deploy/kubernetes/webhook-example/README.md

@@ -23,13 +23,7 @@ make
 Build the docker image
 
 ```bash
-docker build -t gcr.io/your-project-name/webhook:latest -f ./cmd/webhook/Dockerfile .
-```
-
-Push the docker image to the remote registry
-
-```bash
-docker push gcr.io/your-project-name/webhook:latest
+docker build -t validation-webhook:latest -f ./cmd/validation-webhook/Dockerfile .
 ```
 
 ## How to deploy the webhook

deploy/kubernetes/webhook-example/webhook.yaml

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: snapshot-validation
-        image: gcr.io/your-project-name/validation-webhook:latest # change the image if you wish to use your own custom validation server image
+        image: k8s.gcr.io/sig-storage/validation-webhook:v2.2.0 # change the image if you wish to use your own custom validation server image
         args: ['--tls-cert-file=/etc/snapshot-validation-webhook/certs/cert.pem', '--tls-private-key-file=/etc/snapshot-validation-webhook/certs/key.pem']
         ports:
         - containerPort: 443 # change the port as needed