docs(cloud-config-demo): enhence Kubernetes cluster usages

Signed-off-by: lony2003 <zhangke200377@outlook.com>

Author: lony2003

spring-boot-examples/cloud-config-demo/src/main/java/io/dapr/springboot/examples/cloudconfig/DemoController.java

@@ -0,0 +1,21 @@
+package io.dapr.springboot.examples.cloudconfig;
+
+import io.dapr.springboot.examples.cloudconfig.config.SingleConfig;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class DemoController {
+
+  private final SingleConfig singleConfig;
+
+  public DemoController(SingleConfig singleConfig) {
+    this.singleConfig = singleConfig;
+  }
+
+  @GetMapping("/config")
+  public String getConfig() {
+    return singleConfig.getSingleValueSecret();
+  }
+
+}

spring-boot-examples/kubernetes/cloud-config-demo.yaml

@@ -0,0 +1,45 @@
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: cloud-config-demo
+  name: cloud-config-demo
+spec:
+  type: NodePort
+  ports:
+    - name: "cloud-config-demo"
+      port: 8080
+      targetPort: 8080
+      nodePort: 31002
+  selector:
+    app: cloud-config-demo
+
+---
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: cloud-config-demo
+  name: cloud-config-demo
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: cloud-config-demo
+  template:
+    metadata:
+      annotations:
+        dapr.io/app-id: cloud-config-demo
+        dapr.io/app-port: "8080"
+        dapr.io/enabled: "true"
+      labels:
+        app: cloud-config-demo
+    spec:
+      containers:
+        - image: localhost:5001/sb-cloud-config-demo
+          name: cloud-config-demo
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 8080
+              name: cloud-config

spring-boot-examples/kubernetes/secretstore.yaml

@@ -5,3 +5,4 @@ metadata:
 spec:
   type: secretstores.kubernetes
   version: v1
+  metadata: []