helm deployment: Upgrade helm chart to use standard conventions for settings

# 🚀 Feature Request

Helm charts are not following standard helm chart conventions. For example:

## imagePullSecets

(from cert-manager)

```
{{- with .Values.global.imagePullSecrets }}
imagePullSecrets:
{{- toYaml . | nindent 2 }}
{{- end }}
```

## storageClassName

Specify storage class for PVC's

## nodeSelector (map)

Inject into pods to control placement based on key-value pairs.
e.g. https://artifacthub.io/packages/helm/rook/rook-ceph?modal=values

## tolerations

Ability to schedule against a taint

Start by inspecting the Helm chart templates and values for imagePullSecrets, PVC storageClassName, nodeSelector, and tolerations. Compare the existing conventions with the cert-manager and Rook examples linked in the issue. Done means the chart supports these settings using standard Helm conventions and applies them to the relevant workloads.

Written by the indexing model from the issue text.