This message was deleted.

Besides that Maven Local repository is broken by design, you did not declare it as plugin repository. As you can see in your output, it was only searched in the default Gradle Central Plugin Repository. Define

mavenLocal()

as repostiory in

pluginManagement { ... }

in your settings script and it will be searched for plugins instead.

Thanks @Vampire for pointing!

Use https://docs.gradle.org/current/userguide/dependency_resolution.html#sub:ephemeral-ci-cache for sharing dependency cache instead of mavenLocal which is broken in various ways as Björn says.