Added image registry to radar charts

[keyvaann]

The goal of this PR is to allow image registry to be configured in radar helm charts, which should make it easier to define alternative registries that can act as an pull through cache.

In this process a few things have been changed:

• Added Bitnami common chart as a dependency to radar charts. This will help with standardizing the charts and using a unified format.
• To be inline with Bitnami common chart, a backwards incompatible change have been made to use image.pullSecrets instead of imagePullSecrets to define name of the secrets containing image registry credentials.
• Labels have annotations have an updated templateing format but it shouldn't make any changes to the actual release of the charts.

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching charts/*/values.yaml:

• Is the PR adding a new container? Please reviewer, add it to the models (internal process)
• Is the PR adding a new parameter? Please, ensure it’s documented in the README.md

This is an automatically generated QA checklist based on modified files.

[keyvaann]

@pvannierop I remember we had an issue with s3-proxy application version in the helm chart, I don't remember what exactly it was. Do you think that issue will be present here as well?

[pvannierop]

@keyvaann I do not recall this issue to be honest.

[keyvaann]

It was reverted in this commit, 5ac54d6

[pvannierop]

I think this a nice change that will:

1. Allow more extended configuration of the docker image repository (while at the same time clean up the codebase)
2. Allow for standardization between radarbase helm charts by using a bitnami common chart.

However, I do have a comment/suggestion regarding the standardization. I notice that for all affected charts there is a repeated section added in the _helpers.tpl file such ad this:

{{/*
Return the proper image name
*/}}
{{- define "management-portal.image" -}}
{{ include "common.images.image" (dict "imageRoot" .Values.image "global" .Values.global "chart" .Chart ) }}
{{- end -}}

{{/*
Return the proper Docker Image Registry Secret Names
*/}}
{{- define "management-portal.imagePullSecrets" -}}
{{- include "common.images.pullSecrets" (dict "images" (list .Values.image) "global" .Values.global) -}}
{{- end -}}

Would it not be a good opportunity to define this helper in the common chart? If needed we can wrap the bitnami common chart to add shared RADAR-base functionality?

[keyvaann]

Repeated _helper functions are also part of the bitnami chart structure:
https://github.com/bitnami/charts/blob/main/bitnami/drupal/templates/_helpers.tpl#L24
https://github.com/bitnami/charts/blob/main/bitnami/external-dns/templates/_helpers.tpl#L11