feat: add cluster domain for DNS name construction in kubernetes serv…

[artarik]

Pull Request

Description

This feature add possibility to change cluster dns name due generating certificate for weebhook
(with 1 commit)

Fixes #(issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking change which improves an existing feature or documentation)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

How Has This Been Tested?

• change value for .Values.clusterDomain and deploy via

helm upgrade --install keycloak-operator 

• check that kind: Certificate has correct service name

Checklist:

• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Pull Request contains one commit. I squash my commits.

Screenshots (if appropriate):

Additional context

Add any other context or screenshots about the feature request here.