4.21 발생 에러 #1

# ISSUE
* Error Description:
* 상황 : 파이프라인에서 해당 에러 메시지 발생
* 에러 메시지 :
```
The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available for deployment, or some instances in your deployment group are experiencing problems.
```
```
The CodeDeploy agent did not find an AppSpec file within the unpacked revision directory at revision-relative path "appspec.yml". The revision was unpacked to directory "/opt/codedeploy-agent/deployment-root/ce36b597-7a59-4dec-b9b7-0ba1f8e46815/d-J4IEKCC9G/deployment-archive", and the AppSpec file was expected but not found at path "/opt/codedeploy-agent/deployment-root/ce36b597-7a59-4dec-b9b7-0ba1f8e46815/d-J4IEKCC9G/deployment-archive/appspec.yml". Consult the AWS CodeDeploy Appspec documentation for more information at http://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file.html
```

* 시도 대응 :
- 하기 레퍼런스를 바탕으로 에러 로그를 확인해보려 했으나, 로그조차 확인할 수 없어 문제 해결을 보류함
[레퍼런스(링크)](https://docs.aws.amazon.com/ko_kr/codedeploy/latest/userguide/troubleshooting-deployments.html)

# TODO
- [ ] 수동 배포로 방침 선회