Merge pull request #167 from prgrms-be-devcourse/fix/166-ddl-auto-change

Fix: ddl-auto update로 수정

Author: LimKangHyun

backend/src/main/resources/application-prod.yml

@@ -40,7 +40,7 @@ spring:
             user-name-attribute: login
   jpa:
     hibernate:
-      ddl-auto: validate
+      ddl-auto: update
     properties:
       hibernate:
         show_sql: true