feat: run extraVolumes through templating

[Kyrremann]

What this PR does / why we need it:

We wanted to add custom error pages for our load balancer, and since each load balancer dependens on their own ingress-nginx we need to be able to template the volume configmap.

    extraVolumes:
      - name: custom-error-pages
        configMap:
          name: "{{ .Release.Name }}-custom-error-pages"

Now gives us:

      volumes: 
        - configMap: name: '{{ .Release.Name }}-custom-error-pages'

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

How Has This Been Tested?

I've added a Helm chart test that covers my explicit change.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Kyrremann
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[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @Kyrremann. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.