환경변수 다룰때 로그 처리, log 파일 남기기

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환경변수를 가져오는 부분에서 로그 처리 하는 부분이 따로없음.
또한 로그를 파일로 남기지않고 console에서 남기고 있음 이를 파일로 남길 수 있게 설정하는 부분이 필요.
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Look for environment variable loading code and existing logging setup. Determine where logs are currently output to console and configure a file transport. Research logging libraries like winston or pino if not already used. Check for any existing logging configuration files or modules.

Written by the indexing model from the issue text.