Example for JWT

[gaetancollaud]

What this PR does / why we need it:

This is a follow up of #7946

This PR adds an example of how to configure ingress-nginx to use JWT properly and without any issue

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

• increase proxy-buffer-size #7946

How Has This Been Tested?

The solution was tested on digital ocean with an application that uses big JWT. The HTTP 502 error is gone now.

Checklist:

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

[k8s-ci-robot]

@gaetancollaud: This issue is currently awaiting triage.

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[k8s-ci-robot]

Hi @gaetancollaud. 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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[rikatz]

/lgtm
/approve
Thanks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaetancollaud, rikatz

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Needs approval from an approver in each of these files:

• docs/OWNERS [rikatz]

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[gaetancollaud]

@rikatz I see that the page exists but it's not in the menu. Did I miss something?
https://kubernetes.github.io/ingress-nginx/examples/customization/jwt/