Remove nextcloud db readiness check

We instead just wait for the db to be up with the usual docker
wait commands. A little more brittle but the old method ceased
to work.

roles/nextcloud/templates/docker-stack.yml.j2

@@ -31,7 +31,7 @@ services:
       start_period: 5m
     # needed for db to be up,
     # see https://help.nextcloud.com/t/failed-to-install-nextcloud-with-docker-compose/83681/15
-    entrypoint: sh -c "while !(nc -z db 5432); do sleep 30; done; /entrypoint.sh php-fpm"
+    # entrypoint: sh -c "while !(nc -z db 5432); do sleep 30; done; /entrypoint.sh php-fpm"
     environment:
       - NEXTCLOUD_ADMIN_USER={{ nextcloud_app_admin_username }}
       - NEXTCLOUD_ADMIN_PASSWORD={{ nextcloud_app_admin_password }}