fix: prod 환경과 동일하게 cdn 추가

Author: lvalentine6

src/main/resources/application-migration.yml

@@ -54,3 +54,6 @@ oauth:
 
 kakao:
   api-key: ${KAKAO_API_KEY}
+
+cdn:
+  base-url: ${CLOUDFRONT_DOMAIN_NAME}