Switching to v1 admission review

[yue9944882]

This PR bumps the admission review related k8s types from v1beta1 to v1 as k/k has promoted the v1 API to GA on 1.30:

kubernetes/kubernetes#123405

[yue9944882]

/hold

for further discussion

[hernan82arg]

We really need this, since we've upgraded we lost the ability to use it. Will you be looking into this in the near future? Should we look for other solutions?

thanks in advance!!!

[notori0us]

hi friends, any reason we are holding on this?

[SeoGeonhyuk]

Hi, I've been struggling with the received invalid webhook response: expected webhook response of admission.k8s.io/v1, Kind=AdmissionReview, got /, Kind= error on Kubernetes v1.32 with the latest image.

While waiting for this PR to be merged, I found a workaround:

Change the order of admissionReviewVersions in MutatingWebhookConfiguration from ["v1", "v1beta1"] to ["v1beta1", "v1"]. This forces the API server to use v1beta1 when calling the webhook, which the current implementation can handle.

kubectl patch mutatingwebhookconfiguration pod-identity-webhook --type=json \
  -p='[{"op": "replace", "path": "/webhooks/0/admissionReviewVersions", "value": ["v1beta1", "v1"]}]'

This is obviously just a temporary workaround until this PR gets merged. Please consider merging this — the webhook is completely broken on Kubernetes 1.30+ without it.