增加练习生产环境配置

core-main/src/main/resources/application-prac.properties

@@ -0,0 +1,3 @@
+spring.datasource.url=jdbc:mysql://qmthmysql.mysql.rds.aliyuncs.com:3306/exam_cloud_sydx?useUnicode=true&characterEncoding=UTF-8
+spring.datasource.username=exam_cloud
+spring.datasource.password=examcloud123!@#