[Spring-boot] application.properties 고려 순서

- @참고: docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.html#boot-features-external-config

 

* config data 고려 순서(with values from lower items overriding earlier ones)
1. jar 안 application.properties 
2. jar 안 application-{profile}.properties
3. jar 밖 application.properties
4. jar 밖 application-{profile}.properties

* application.properties에 추가 속성 override하기
- properties
spring.profile.active=dev,hsqldb
- command line
--spring.profile.active=dev,hsqldb