[helm chart] add default issuerRef.group for selfsigned cert

[Azahorscak]

Issue

3867

Description

Certificates will fail to automatically renew when newer versions of cert-manager (tested on 1.15.2 and 1.15.3) don't have a default Issuer defined in the cluster and the certificate does not specify issuerRef.group. It Fails with Unknown issuer kind: Issuer

Since cert-manager is considered a pre-req to use the self-signed issuer/cert config in this chart, the chart should define this value by default when enableCertManager is set to true so that no further config is required for cert-manager to function as expected.

This PR adds this field and sets it to cert-manager.io

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[linux-foundation-easycla]

• ✅login: Azahorscak / (5817281)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @Azahorscak. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Azahorscak
Once this PR has been reviewed and has the lgtm label, please assign m00nf1sh for approval. For more information see the Kubernetes Code Review Process.

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[mloiseleur]

/ok-to-test

[mloiseleur]

This field is present in the CRD since v1.0.0 of cert-manager, so I guess this change is safe.
/lgtm

[mloiseleur]

/unassign @mloiseleur

[Azahorscak]

/assign @M00nF1sh

[Azahorscak]

Hi a friendly reminder that this is good to go @M00nF1sh @johngmyers @kishorj

[Azahorscak]

IMO this can be closed now as the origin-ca-issuer has resolved the issue, see - cloudflare/origin-ca-issuer#149