Update 'docker-compose.yml'

docker-compose.yml

@@ -1,13 +1,18 @@
 version: '3.3'
 services:
-### MySQL Container
+  db:
-  mysql:
+    image: mysql:5.7
-    build:
+    restart: always
-      context: .
+    environment:
-      args:
         - MYSQL_DATABASE=${MYSQL_DATABASE}
         - MYSQL_USER=${MYSQL_USER}
         - MYSQL_PASSWORD=${MYSQL_PASSWORD}
         - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
     ports:
-      - "${MYSQL_PORT}:3306"
+      - '3306:3306'
+    expose:
+      - '3306'
+    volumes:
+      - my-db:/var/lib/mysql
+volumes:
+  my-db: