chore: db 접속 url 변경

Author: 2jiyong

src/main/resources/application-dev.yml

@@ -1,6 +1,6 @@
 spring:
   datasource:
-    url: jdbc:mysql://localhost:3306/intro
+    url: jdbc:mysql://db:3306/intro?serverTimezone=UTC&allowPublicKeyRetrieval=true&useSSL=false
     username: ${DB_USER}
     password: ${DB_PASSWORD}
     driver-class-name: com.mysql.cj.jdbc.Driver