`postrender` not working

What happened?

Hi, I would like to use the postrender argument for kubernetes.helm.v3.Release:

kubernetes.helm.v3.Release(
    "core",
    name="test",
...
    postrender="/tmp/z.sh"
)

where:

$ cat /tmp/z.sh
#!/usr/bin/env bash
cat <&0 >/tmp/z.out

I do not get any error during pulumi preview but the /tmp/z.out file is not created.

I have noticed that the postrender argument for the terraform-helm-provider has 2 inputs:

binary_path
args

In fact using:

resource "helm_release" "resource-name" {
  ....
  postrender{
    binary_path = "/tmp/z.out"
  }
  ...
}

is working as expected

Steps to reproduce

pulumi preview

Expected Behavior

Create the /tmp/z.out file

Actual Behavior

The /tmp/z.out file is not created

Versions used

CLI          
Version      3.34.1
Go Version   go1.17.11
Go Compiler  gc

Plugins
NAME        VERSION
gcp         6.28.0
kubernetes  3.19.3
python      unknown
random      4.8.0

Host     
OS       fedora
Version  36
Arch     x86_64

This project is written in python: executable='/usr/bin/python3' version='3.10.4'

Backend        
Name           8edf22ccf4ef
URL            file:///data/pulumi/.pulumi-local-states/vgervasi-dev-20220620t075904
User           root
Organizations  

Dependencies:
NAME               VERSION
gpg                1.15.1
libcomps           0.1.18
pip                21.3.1
pulumi-gcp         6.28.0
pulumi-kubernetes  3.19.3
pulumi-random      4.8.0
rpm                4.17.0
setuptools         59.6.0

Additional context

No response

Contributing

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pulumi / pulumi-kubernetes