@Gradle v1.2.0 of the Gradle Plugin Publish Plugin adds a `--validate-only` flag to the `publishPlugin` which only validates the relevant metadata for the plugin you are publishing, akin to a dry run.

There is also now support for using Sigstore (https://sigstore.dev) for plugin signing and a bugfix for how the Shadow plugin interacted with plugin JARs.

https://docs.gradle.org/8.1-rc-4/release-notes.html#plugin-publishing-to-the-gradle-plugin-portal

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