docs: add Kubernetes restore example

docs/how-tos/restore-from-s3.md

@@ -48,4 +48,54 @@ services:
       - web
 networks:
   web:
+```
+
+## Restore on Kubernetes
+
+
+### Simple Kubernetes CronJob usage:
+
+```yaml
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: bkup-job
+spec:
+  schedule: "0 1 * * *"
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          containers:
+          - name: mysql-bkup
+            image: jkaninda/mysql-bkup
+            command:
+            - /bin/sh
+            - -c
+            - mysql-bkup restore -s s3 --path /custom_path -f store_20231219_022941.sql.gz
+            env:
+              - name: DB_PORT
+                value: "3306" 
+              - name: DB_HOST
+                value: ""
+              - name: DB_NAME
+                value: ""
+              - name: DB_USERNAME
+                value: ""
+              # Please use secret!
+              - name: DB_PASSWORD
+                value: ""
+              - name: AWS_S3_ENDPOINT
+                value: "https://s3.amazonaws.com"
+              - name: AWS_S3_BUCKET_NAME
+                value: "xxx"
+              - name: AWS_REGION
+                value: "us-west-2"    
+              - name: AWS_ACCESS_KEY
+                value: "xxxx"        
+              - name: AWS_SECRET_KEY
+                value: "xxxx"    
+              - name: AWS_DISABLE_SSL
+                value: "false"
+          restartPolicy: OnFailure
 ```