增加nacos依赖，可以注册nacos了

mooctest-site-server/pom.xml

@@ -427,7 +427,11 @@
             <artifactId>spring-boot-starter-log4j2</artifactId>
             <version>${spring.boot.version}</version>
         </dependency>
-
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
+            <version>0.9.0.RELEASE</version>
+        </dependency>
     </dependencies>
 
     <build>