docs: update kubernetes deployment

docs/how-tos/deploy-on-kubernetes.md

@@ -10,7 +10,60 @@ nav_order: 8
 To deploy PostgreSQL Backup on Kubernetes, you can use Job to backup or Restore your database.
 For recurring backup you can use CronJob, you don't need to run it in scheduled mode. as described bellow.
 
-## Backup Job
+## Backup Job to S3 Storage
+
+```yaml
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: backup
+spec:
+  template:
+    spec:
+      containers:
+      - name: pg-bkup
+        # In production, it is advised to lock your image tag to a proper
+        # release version instead of using `latest`.
+        # Check https://github.com/jkaninda/pg-bkup/releases
+        # for a list of available releases.
+        image: jkaninda/pg-bkup
+        command:
+        - bkup
+        - backup
+        - --storage
+        - s3
+        resources:
+          limits:
+            memory: "128Mi"
+            cpu: "500m"
+        env:
+          - name: DB_PORT
+            value: "5432"
+          - 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: Never
+```
+
+## Backup Job to SSH remote Server
 
 ```yaml
 apiVersion: batch/v1
@@ -181,7 +234,10 @@ spec:
 ```
 
 ## Kubernetes Rootless
-    
+
+This image also supports Kubernetes security context, you can run it in Rootless environment.
+It has been tested on Openshift, it works well.
+Deployment on Openshift is supported, you need to remove `securityContext` section on your yaml file.
 
 ```yaml
 apiVersion: batch/v1