Bug in the script "wait-for-manager.sh"

When I try to mount **/var/lib/postgresql/data** from worker to a local host directory in my docker-compose.yml it throws the exeption:
`chmod: changing permissions of '/var/lib/postgresql/data': Operation not permitted`

Possible solution is to change the script "wait-for-manager.sh" like that:
```
set -e

until test -f /healthcheck/manager-ready ; do
>&2 echo "Manager is not ready - sleeping"
sleep 1
done

>&2 echo "Manager is up - starting worker"

exec "/docker-entrypoint.sh" "postgres"
```

citus version: 9.4.1
postgres version: 12