Ingress NGINX: Remove NGINX v1.21.

[Gacko]

The PR title might suggest removing NGINX v1.21. Actually we are renaming nginx-1.25 to just nginx in the Ingress NGINX repository. As there already is a job config for nginx, which was used for NGINX v1.21 before, we effectively just remove the NGINX v1.25 config and re-use the NGINX v1.21 config.

Please consider also reviewing kubernetes/ingress-nginx#12031 when reviewing this PR as they need to get merged/unhold shortly after each other.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[Gacko]

/cc @ameukam @BenTheElder @strongjz @rikatz @cpanato @tao12345666333

[strongjz]

It's hard to read on mobile, but we can't delete images in the k8s.io registry.

[strongjz]

Oh, this is the job, not the registry ;)

It's hard to read on mobile, but we can't delete images in the k8s.io registry.

[ameukam]

/approve

[cpanato]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ameukam, cpanato, Gacko

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[Gacko]

/unhold

[k8s-ci-robot]

@Gacko: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key k8s-staging-ingress-nginx.yaml using file config/jobs/image-pushing/k8s-staging-ingress-nginx.yaml

In response to this:

The PR title might suggest removing NGINX v1.21. Actually we are renaming nginx-1.25 to just nginx in the Ingress NGINX repository. As there already is a job config for nginx, which was used for NGINX v1.21 before, we effectively just remove the NGINX v1.25 config and re-use the NGINX v1.21 config.

Please consider also reviewing kubernetes/ingress-nginx#12031 when reviewing this PR as they need to get merged/unhold shortly after each other.

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