fix: NODE_ENV is not a valid object name

Author: tuturd

Dockerfile

@@ -6,7 +6,6 @@ ARG NEXT_PUBLIC_CAS_SERVICE_URL=http://localhost:3000
 ARG NEXT_PUBLIC_API_VERSION=v1
 ARG NEXT_PUBLIC_API_REQUEST_TIMEOUT=10000
 
-ENV NODE_ENV=${NODE_ENV}
 ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
 ENV NEXT_PUBLIC_CAS_SERVICE_URL=${NEXT_PUBLIC_CAS_SERVICE_URL}
 ENV NEXT_PUBLIC_API_VERSION=${NEXT_PUBLIC_API_VERSION}