Investigate on if k8s should still use dockershim

[gthao313]

The dockershim had been deprecated few years ago but we still use it. We should investigate on if we should still use it or remove it. https://kubernetes.io/blog/2020/12/02/dockershim-faq/

[stockholmux]

Wouldn't this be a potential breaking change?

[arnaldo2792]

We have this change that started the cleanup:

https://github.com/bottlerocket-os/bottlerocket/pull/3135

In newer variants, we should investigate if we can stop symlinking the containerd socket.

[bcressey]

@gthao313 what do you mean "we still use it"? We provide a symlink from dockershim.sock to containerd.sock but Bottlerocket itself doesn't depend on dockershim.sock functionality.

[stockholmux]

I, personally, don't understand the consequence of the symlink staying. It's near zero cost and removing it might break someone. (Feel free to tell me I'm wrong because of XYZ!)