adding example for hardened linux clusters based on example

hardened/frontend-deployment.yaml

@@ -0,0 +1,33 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: frontend
+spec:
+  selector:
+    matchLabels:
+      app: guestbook
+      tier: frontend
+  replicas: 3
+  template:
+    metadata:
+      labels:
+        app: guestbook
+        tier: frontend
+    spec:
+      containers:
+      - name: php-redis
+        securityContext:
+          allowPrivilegeEscalation: false
+          runAsNonRoot: true
+          runAsUser: 1000
+          seccompProfile:
+            type: RuntimeDefault
+          capabilities:
+            drop: ["ALL"]
+        image: us-docker.pkg.dev/google-samples/containers/gke/gb-frontend:v5
+        resources:
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        ports:
+        - containerPort: 80