Allow specifying the name of the header for forwarding client certificates

[tuxillo]

What this PR does / why we need it:

Try to address #3511 .

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] 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

Which issue/s this PR fixes

How Has This Been Tested?

Just did a make build:)

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.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: tuxillo / name: Antonio Huete Jimenez (affd8733a07dae159ee04a38a4f9d1378f7b8b49)

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[k8s-ci-robot]

This issue is currently awaiting triage.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @tuxillo. 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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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: tuxillo Once this PR has been reviewed and has the lgtm label, please assign tao12345666333 for approval. For more information see the Kubernetes Code Review Process.

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[github-actions[bot]]

This is stale, but we won't close it automatically, just bare in mind the maintainers may be busy with other tasks and will reach your issue ASAP. If you have any question or request to prioritize this, please reach #ingress-nginx-dev on Kubernetes Slack.

[tuxillo]

Yes please, don't close it :)

[rikatz]

It wont :) I just didn't had time to reach it, maybe on weekend (no promises, but will try!)

[rikatz]

@tuxillo I cant remember if we have an e2e test for authttls, but if we do do you mind adding a case for this annotation? Thanks!

[k8s-ci-robot]

PR needs rebase.

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