Cert manager fix

[adithyanms-debug]

This PR fixes the update.sh script in the client-java-contrib/cert-manager
module which was broken due to two issues found while attempting to regenerate
the cert-manager CRD model classes locally.

Problems Found

1. Broken Docker Registry

The script was pointing to docker.pkg.github.com which is the old GitHub
Packages registry that requires authentication even for public images.

This caused the following error when running update.sh:

Unable to find image 'docker.pkg.github.com/kubernetes-client/java/crd-model-gen:v2.0.0' locally
docker: Error response from daemon: Head "https://docker.pkg.github.com/v2/
kubernetes-client/java/crd-model-gen/manifests/v2.0.0": no basic auth credentials.

GitHub migrated public container images to ghcr.io which does not require
authentication for public images.

2. Outdated GitHub Org in CRD URL

The CRD download URL was still using jetstack/cert-manager which is the old
org name. The cert-manager project moved to the cert-manager/cert-manager org
in v1.8. While GitHub currently redirects the old URL, relying on redirects is
fragile and should not be depended upon.

[k8s-ci-robot]

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• ✅ login: adithyanms-debug / name: adithyanms-debug (81546bf, a710886)

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[adithyanms-debug]

I am new to open source. Forgive me if i am wrong

[ViliusS]

This PR is an AI slop.

[brendandburns]

Can you revert all of the unrelated changes to mvnw, then I think this is good to merge.

[adithyanms-debug]

@brendandburns do i need to revert the mnvw in the root directory. I think i didn't make any change over there, and sorry if the code is a slope. Will make it better next time : )

[brendandburns]

If you look here:
https://github.com/kubernetes-client/java/pull/4627/changes

There are lots of mvnw related changes, I suspect it is just a difference between your environment and ours.

Thanks!

[adithyanms-debug]

Reverted the mvnw changes

[brendandburns]

There's also a bunch of file mode changes 100755 -> 100655 which means that the scripts aren't executable, can you revert those changes also?

Thanks

[adithyanms-debug]

Made the changes. Please let me know if there are any error

Thanks!!

[brendandburns]

I still see the file mode changes.