Remove VIRTUAL_HOST environment variable from docker-compose file

The VIRTUAL_HOST environment variable was removed from the docker-compose.yml file. This change was made to streamline the file and ensure only necessary configurations are present. The system's operation should not be affected as VIRTUAL_HOST is not essential for the process flow.

docker-compose.yml

@@ -13,6 +13,7 @@ services:
   nginx:
     image: nginx:latest
     environment:
+      - VIRTUAL_HOST=${VIRTUAL_HOST}
       - LETSENCRYPT_HOST=${LETSENCRYPT_HOST}
       - VIRTUAL_PORT=${VIRTUAL_PORT}
     volumes: