Question: how to publish Gradle Plugins?

We would like to publish a Plugin for Gradle to the central Gradle Plugin Portal which is the equivalent of MavenCentral.

Is there a process that we must follow, like there is for publishing java artifacts? As far as I know, the Plugin Portal requires an account, and to publish, one must submit a key and a secret. Should we publish plugins also via JIPP, or can we do this in our own CI/CD, which is Github Actions?