chore: Nginx proxy_pass envsubst 환경변수 전환#394

SnailW wants to merge 4 commits intochore/389-split-docker-compose-by-instanceboostcampwm2025/web15-ipconfig:chore/389-split-docker-compose-by-instancefrom

chore/390-nginx-envsubst-proxyboostcampwm2025/web15-ipconfig:chore/390-nginx-envsubst-proxyCopy head branch name to clipboard