Migrate busybox image to ghcr

[akagami-harsh]

Pull Request Template for Kubeflow Manifests

✏️ Summary of Changes

• Migrated busybox image form registry.k8s.io/busybox to ghcr.io/containerd/busybox

📦 Dependencies

List any dependencies or related PRs (e.g., "Depends on #123").

🐛 Related Issues

• ErrImagePull: registry.k8s.io/busybox:latest #3171

✅ Contributor Checklist

• I have tested these changes with kustomize. See Installation Prerequisites.
• All commits are signed-off to satisfy the DCO check.
• I have considered adding my company to the adopters page to support Kubeflow and help the community, since I expect help from the community for my issue (see 1. and 2.).

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[juliusvonkohout]

Are you sure that this is enough? Did you search the rendered manifests for busybox?
Is it only istio or also KFP?

[akagami-harsh]

Are you sure that this is enough? Did you search the rendered manifests for busybox? Is it only istio or also KFP?

Yes, i only found two images after building from /example, one is used by istio and other by KFP

[juliusvonkohout]

/lgtm
/approve

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