Publish plugin and Sonatype OSSRH

Hi @rpomeroy1

We still expose a maven-compatible repository structure from the plugin portal. Set your upstream repository in your local caching repository to point to https://plugins.gradle.org/m2/ and use the non-incubating syntax for applying the plugins, ie use a classpath dependency in the buildscript block and apply plugin: 'foo' rather than using the plugins block with an id.

Hope that helps