I am trying to publish to MavenCentral a Kotlin Multiplatform library. When I didn't have windows artifacts there were no problems, but after adding the Windows one I need to use a matrix in GitHub Actions, and this is causing that two repositories are created in Nexus Dashboard.

I've seen the same in the past. What happens if you close and release both repositories? Do they get merged somehow?

I didn't try, I saw this problem in the past when Sonatype has having overload but I just drop them and reupload. But I don't know if a released repo in mavenCentral can add artifacts, I thought it can't 🤔

Yea, I've always been afraid to do so as well 😅

I remember adding artifacts to a release in the past (as I had a partial deployment). You have to do it manually through the sonatype UI though

Yeah, I just tried and it seems that I can release multiple repos via UI. I was using codearte plugin to close via gradle but it is not possible now but at least it works, thank you 🙂

It has always created multiple for me. As long as the artifacts are unique across those, it should be fine. I just release them all

With

id("de.marcphilipp.nexus-publish")

and without using multiple machines I get only one repo, multiple repos with only one machine was happening to me with

maven-publish