fix dependencies on containers

docker-compose.nginx.yml

@@ -1,6 +1,10 @@
 version: "3"
 
 services:
+  mattermost:
+    depends_on:
+      - nginx
+
   nginx:
     container_name: nginx_mattermost
     image: nginx:${NGINX_IMAGE_TAG}

docker-compose.yml

@@ -21,7 +21,6 @@ services:
   mattermost:
     depends_on:
       - postgres
-      - nginx
     container_name: mattermost
     image: mattermost/${MATTERMOST_IMAGE}:${MATTERMOST_IMAGE_TAG}
     restart: ${RESTART_POLICY}