use path to nginx config instead of config file itself

docker-compose.nginx.yml

@@ -10,7 +10,7 @@ services:
     image: nginx:${NGINX_IMAGE_TAG}
     restart: ${RESTART_POLICY}
     volumes:
-      - ${NGINX_MATTERMOST_CONFIG}:/etc/nginx/conf.d/mattermost.conf:ro
+      - ${NGINX_CONFIG_PATH}:/etc/nginx/conf.d:ro
       - ${NGINX_DHPARAMS_FILE}:/dhparams4096.pem
       - ${CERT_PATH}:/cert.pem:ro
       - ${KEY_PATH}:/key.pem:ro

env.example

@@ -28,7 +28,8 @@ POSTGRES_DB=mattermost
 ## `sudo chown -R 101:101 ./nginx` if needed.
 NGINX_IMAGE_TAG=alpine
 
-NGINX_MATTERMOST_CONFIG=./nginx/mattermost.conf
+## The folder containing server blocks and any additional config to nginx.conf
+NGINX_CONFIG_PATH=./nginx/conf.d
 NGINX_DHPARAMS_FILE=./nginx/dhparams4096.pem
 
 CERT_PATH=./volumes/web/cert/cert.pem