Add port mount

Author: kabilar

docker/docker-compose.yml

@@ -10,6 +10,8 @@ services:
     image: datajoint/mysql:${MYSQL_VER}
     environment:
       - MYSQL_ROOT_PASSWORD=${DJ_PASS}
+    ports:
+      - "3306:3306"
     healthcheck:
       test: [ "CMD", "mysqladmin", "ping", "-h", "localhost" ]
       timeout: 30s