add example for deloy obconfigserver using mysql as backend (#268)

example/webapp/configserver-mysql.yaml

@@ -0,0 +1,60 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: svc-ob-configserver
+  namespace: oceanbase
+spec:
+  type: NodePort
+  selector:
+    app: ob-configserver
+  ports:
+    - name: "http"
+      port: 8080
+      targetPort: 8080
+      nodePort: 30080
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: ob-configserver
+  namespace: oceanbase
+spec:
+  selector:
+    matchLabels:
+      app: ob-configserver
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: ob-configserver
+    spec:
+      containers:
+        - name: ob-configserver
+          image: oceanbase/ob-configserver:1.0.0-2
+          ports:
+            - containerPort: 8080
+              name: "http"
+          env:
+            - name: DATABASE_TYPE
+              value: mysql
+            - name: SVC_ADDRESS
+              value: $(SVC_OB_CONFIGSERVER_SERVICE_HOST)
+            - name: SVC_PORT
+              value: $(SVC_OB_CONFIGSERVER_SERVICE_PORT)
+            - name: META_HOST
+              value: $(SVC_MYSQL_SERVICE_HOST)
+            - name: META_PORT
+              value: $(SVC_MYSQL_SERVICE_PORT)
+            - name: META_USER
+              value: 'root'
+            - name: META_PASSWORD
+              value: '******'
+            - name: META_DATABASE
+              value: 'configserver'
+          resources:
+            limits:
+              memory: 2Gi
+              cpu: "1"
+            requests:
+              memory: 200Mi
+              cpu: 100m

example/webapp/mysql.yaml

@@ -0,0 +1,41 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: svc-mysql
+  namespace: oceanbase
+spec:
+  selector:
+    app: mysql
+  ports:
+  - port: 3306
+    protocol: TCP
+    targetPort: 3306
+  type: ClusterIP
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: mysql
+  name: mysql
+  namespace: oceanbase
+spec:
+  selector:
+    matchLabels:
+      app: mysql
+  template:
+    metadata:
+      labels:
+        app: mysql
+    spec:
+      containers:
+      - env:
+        - name: MYSQL_ROOT_PASSWORD
+          value: '******'
+        image: mysql:5.7
+        imagePullPolicy: IfNotPresent
+        name: mysql
+        ports:
+        - containerPort: 3306
+          protocol: TCP
+      restartPolicy: Always