fixed bug with nginx env

Author: dmitriy

docker/nginx/Dockerfile

@@ -1,7 +1,7 @@
 FROM nginx:1.15-alpine
 
 # set main params
-ARG BUILD_ARGUMENT_APP_ENV=dev
+ARG BUILD_ARGUMENT_ENV=dev
 ENV ENV=$BUILD_ARGUMENT_ENV
 
 RUN ln -sf /dev/stdout /var/log/nginx/access.log && \