Add release automation for api, kyaml, cmd/config, and kustomize CLI

Eschewed features

[X] This issue is not requesting templating, unstuctured edits, build-time side-effects from args or env vars, or any other eschewed feature.

What would you like to have added?

We need github action definitions for

Releasing api module
Releasing kyaml module
Releasing cmd/config module
Releasing kustomize CLI
Notify release and test result to messaging channels (e.g. Slack)

Why is this needed?

As part of release automation improvement https://github.com/kubernetes-sigs/kustomize/issues/3952
We need to automate current release process to ensure stability and efficiency
Reducing toil of releasing

Can you accomplish the motivating task without this feature, and if so, how?

Yes, by following the release documentation on releasing/README.md with several manual task. This task simply act as an improvement for current release process

What other solutions have you considered?

For releasing process, I have considered pure bash scripting as alternative. While it might give flexibility, it's more difficult maintain and less readable. Decided to use Github action instead considering it as current tools used for releasing and can integrate seamlessly with Github features.

For notification feature, I have discussed with the maintainer and we have decided to send the notifications to maintainers' email, considering creating Slack account will require additional wait for action from kubernetes' Slack maintainer. However this decision might change if Github action is not suitable for this feature.

Anything else we should know?

CI/CD design should follow CI/CD best practices, there is no single rule on what best practice is. But generally guides share common characteristics:

CI/CD steps should be split into individual stages
Automate as much as possible
Operations are idempotent and retryable
Enable roll back mechanism
Enable manual mechanism
Notify people for faster reaction, notification feature is more of a nice-to-have
For more, refer to this page: https://resources.github.com/ci-cd/

I have discussed with the maintainers for the release design and there's a collaboration page as a reference. Please find it here

Feature ownership

[X] I am interested in contributing this feature myself! 🎉

kubernetes-sigs / kustomize