fix docker compose

docker-compose.test.yml

@@ -30,10 +30,6 @@ services:
     volumes:
      - ep-mysql-volume:/var/lib/mysql
      - /srv/initdb/etherpad:/docker-entrypoint-initdb.d/
-    healthcheck:
-      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
-      timeout: 20s
-      retries: 20
   etherpad:
     image: etherpad/etherpad
     container_name: test_etherpad