feat(keycloak): add availability to expose extra port on sts

[jBouyoud]

What this PR does / why we need it:

In order to configure a port restriction on Keycloak admin console (https://github.com/keycloak/keycloak-documentation/blob/master/server_admin/topics/threat/admin.adoc#port-restriction) let the possibilty to the users to expose a custom port on the statefulset

Which issue this PR fixes

None

Special notes for your reviewer:

Checklist

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md

[thomasdarimont]

Hi @jBouyoud this looks interesting!

Out of curiosity, how do you configure Keycloak to expose the admin console on a different port?

[jBouyoud]

Hi,

You can find the link to achieve this modification in the description of this PR (https://github.com/keycloak/keycloak-documentation/blob/master/server_admin/topics/threat/admin.adoc#port-restriction).
After that I declare a k8s service for http-admin and an ingress in my chart that depends on keycloak chart.

[jBouyoud]

Hi @thomasdarimont ,

Does anything missing to be able to merge this PR ?

[thomasdarimont]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jBouyoud, thomasdarimont

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