I was wondering why there was no GitHub Action to setup Kotlin cli compiler, so I've built one:
https://github.com/marketplace/actions/setup-kotlin Sure, that's not required if you use Gradle, Maven etc, but for scripting it might be useful. You can also provide a script to the action which will directly be executed.
I don't know if this is useful to anyone, but I can see uses in small scripts in your ci pipelines where you would prefer Kotlin over Bash or Python. (not sure if this is the right cannel for this)