Add extraObjects like Traefik's chart

[rgarrigue]

Hello again,

One suggestion would be to add in the templates a manifests to allow extra objects, like it's done in Traefik, ArgoCD and other charts. To quote Traefik's chart, the additional template file

{{- range .Values.extraObjects }}
---
{{ include "traefik.render" (dict "value" . "context" $) }}
{{- end }}

And from the values.yaml

#
# -- Extra objects to deploy (value evaluated as a template)
#
# In some cases, it can avoid the need for additional, extended or adhoc deployments.
# See #595 for more details and traefik/tests/values/extra.yaml for example.
extraObjects: []

A typical usage would be to add a SealedSecret there with the OIDC client secret.

Thanks,