optimize docker-compose file

docker-compose.yml

@@ -1,7 +1,12 @@
-version: '3'
+version: '3.7'
+
+x-default: &default
+  restart: always
+  env_file: .env
 
 services:
   wp:
+    <<: *default
     image: wordpress:5-apache
     volumes:
       - ./uploads.ini:/usr/local/etc/php/conf.d/uploads.ini:ro
@@ -9,11 +14,9 @@ services:
       - ./liquet:/var/www/html/wp-content/themes/liquet:ro
     ports:
       - 80:80
-    env_file: .env
 
   db:
+    <<: *default
     image: mariadb:10.3
-    restart: always
     volumes:
       - ./data/db:/var/lib/mysql
-    env_file: .env