개발 서버 GraphQL playground 세팅

[dotoleeoak]

Describe the problem and solution

개발 서버에서 GraphQL 문서를 확인할 수 없는데, Caddy 설정을 바꾸면 좋을 거 같아요...! https://dev.codedang.com/graphql

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• [X] Read the Contributing Guidelines
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