[Improvement] [Alert Server] Add default datasource url in alert server application.yaml for consistency (#10790)

* [Improvement] [Alert Server] Add default datasource url in alert server application.yaml for consistency (#10788)

* [Improvement] [Alert Server] Add newline at end of file (#10788)

dolphinscheduler-alert/dolphinscheduler-alert-server/src/main/resources/application.yaml

@@ -76,3 +76,6 @@ spring:
       on-profile: mysql
   datasource:
     driver-class-name: com.mysql.cj.jdbc.Driver
+    url: jdbc:mysql://127.0.0.1:3306/dolphinscheduler
+    username: root
+    password: root