`singleuser: extraPodConfig:` does not get set by the helm chart

[goseind]

Bug description

I'm trying to set fsGroupChangePolicy: "OnRootMismatch" to the securityContext of my single user containers - as this is required by my cloud provider - like so:

singleuser:
   extraPodConfig:
     securityContext:
       fsGroupChangePolicy: "OnRootMismatch"

However, it doesn't work and the value does not get set once a user starts a session.

Linking also the discourse post regarding this issue: https://discourse.jupyter.org/t/extrapodconfig-values-do-not-get-set/17868

Expected behavior

Once a user starts a notebook, the pod securityContext should contain the above value, like so:

kind: Pod
metadata:
  name: user-pod
spec:
  containers:
    securityContext:
      fsGroupChangePolicy: "OnRootMismatch"

Actual behavior

The value does not get set, instead, the standard values are applied, so the values fsGroupChangePolicy: "OnRootMismatch" does not get set at all.

How to reproduce

Default helm installation with just the above config set in it.

Your personal set up

• OS: default images (K8s helm installation)

• Version(s): zero-to-jupyterhub with jupyterhub official release 2.0.0 and 2.0.1-0.dev.git.5994.hdf257a2c both not working as expected

I'm using the terraform helm provider to install the chart but have also tried the same with a regular helm install.

Full environment

n/a

# paste output of `pip freeze` or `conda list` here

Configuration

default

# jupyterhub_config.py

Logs

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[wiegerthefarmer]

Any update on this? I've tried so many ways to get fsGroupChangePolicy set. The only way it works is if I have it in a yaml file that I manually start pods with, but that's not how our system works.