improve production docker-compose.yml in README

README.md

@@ -47,7 +47,7 @@ Below is an example `docker-compose.yml` for production deployments that pulls i
 
 ```yaml
 services:
-  db:
+  mariadb:
     image: mariadb:latest
     restart: unless-stopped
     environment:
@@ -61,11 +61,14 @@ services:
   php-fpm:
     image: gitea.auvem.com/auvem/wordpress-docker/php-fpm:7.4-stable
     restart: unless-stopped
+    depends_on:
+      - mariadb
     volumes:
       - ./wp_root:/var/www/html:rw
 
   nginx:
     image: gitea.auvem.com/auvem/wordpress-docker/nginx:latest
+    restart: unless-stopped
     ports:
       - "80:80"
     depends_on: