How to change the gid and uid of user account postgres?

[viciss]

Hi,
Currently we are using postgres image in our Kubernetes environment, and we use nfs as our data volume solution, that is to say, /var/lib/postgresql/data in postgres image will be mounted to a share folder on nfs server finally, let's say /var/vols/data on nfs server.
The problem is in nfs server configuration, administrator sets the anongid and anonuid to an id that is different with postgres account in docker image, for example, 1999, while the gid and uid of postgres account is 999, and then we got this error:
chown: changing ownership of ‘/var/lib/postgresql/data’: Operation not permitted

Any suggested solutions to solve this problem?
Thanks,
Viciss