feat(demo-nginx): Add deployment and service manifests

apps/demo-nginx/deployment.yaml

@@ -0,0 +1,62 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: demo-nginx
+  namespace: demo-app
+  labels:
+    app: demo-nginx
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: demo-nginx
+  template:
+    metadata:
+      labels:
+        app: demo-nginx
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "80"
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.25.3  # This will be updated by Jenkins pipeline
+        ports:
+        - containerPort: 80
+          name: http
+        resources:
+          requests:
+            cpu: 100m
+            memory: 128Mi
+          limits:
+            cpu: 200m
+            memory: 256Mi
+        livenessProbe:
+          httpGet:
+            path: /
+            port: 80
+          initialDelaySeconds: 10
+          periodSeconds: 10
+        readinessProbe:
+          httpGet:
+            path: /
+            port: 80
+          initialDelaySeconds: 5
+          periodSeconds: 5
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: demo-nginx
+  namespace: demo-app
+  labels:
+    app: demo-nginx
+spec:
+  type: ClusterIP
+  selector:
+    app: demo-nginx
+  ports:
+  - port: 80
+    targetPort: 80
+    protocol: TCP
+    name: http