update docker-compose.yml

 version: "3.7"
 services:
   mysql:
+    image: mysql:8.0.19
     container_name: mysql
     ports:
       - 3306:3306
-    image: mysql:8.0.19
+    expose:
+      - "3306"
     restart: always
     environment:
       MYSQL_DATABASE: $${MYSQL_DATABASE}
@@ -13,7 +15,7 @@ services:
       - /var/lib/mysql
   prisma:
     links:
-      - mysql
+      - "mysql"
     depends_on:
       - mysql
     container_name: prisma