The Ubuntu docker image kubechecks uses is slated for EOL this year

[ahinh43]

From ubuntu's release-cycle docs we use the Ubuntu 20.04 image for Kubechecks and Ubuntu 20.04 is slated for standard EOL around late April-May of 2025.

We should update the image as it's a few major versions behind anyway. I plan to tackle this when I have a few free cycles.

[Greyeye]

@ahinh43 @djeebus
What do you think of running smaller image like distroless/alpine instead of running ubuntu22, 24?
Bit of work as we may have to remove all binaries like helm, git, kustomize and use API instead.

as the latest change walk kustomize by API, I dont think we're using the kustomize binary, not sure about helm.