Release v2.1.0

Feature

• 아카이브 커버 이미지 타입 정의
• 어드민용 로직 추가 (로그인 등)

Development

• Migration to Spring boot 3.0 (https://binux.tistory.com/160)
• Replacement from Java to Kotlin (application, common module)
• Use springdoc-openapi for api documentation instead of Springfox
• Set caffeine cache
• Set temporary CORS (for admin)

Infra

• Migration to Oracle cloud from AWS
• Set monitoring (Prometheus/Garafna) using docker-compose