[fix] No named volume for database persistent state

Use an anonymous volume instead, for compatibility with Rancher Desktop for Mac (which unlike Docker Desktop, won't let your containers wield superuser file privilges)

docker-compose.yml

@@ -21,7 +21,7 @@ services:
     ports:
       - 3306:3306
     volumes:
-      - ./volumes/db:/var/lib/mysql
+      - /var/lib/mysql
 
   phpmyadmin:
       image: phpmyadmin/phpmyadmin