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A more indicative title would be: Hints for a self-hosted Java CI/CD with Github actions.

If you're using Gitlab and languages other than Java, there is nothing useful in this blog post.

You are right, but it does illustrate how little is needed to get your code of the ground. See https://github.com/sdras/awesome-actions for a list of plug n' play building blocks. And there are a bunch of different triggers and patterns (https://help.github.com/en/actions/reference/events-that-tri...) you can listen to, all tightly coupled with your code and (GitHub) UI.

There is a lot of bang for the buck here.

I would change your assertion from "Java" to "JVM-hosted languages"