Release staged deployments to Maven Central automatically

[Vacxe]

What changed

Adds one step to the shared release workflow (publish-release-workflow.yaml), right after the Gradle upload:

POST https://ossrh-staging-api.central.sonatype.com/manual/upload/defaultRepository/io.github.kakaocup?publishing_type=automatic&deployment_name=<project>-<run number>

authenticated with the same SONATYPE_USERNAME / SONATYPE_PASSWORD secrets the upload uses.

Why

Tonight's "Publish All Libraries Release" run (#33818703554) was green, but nothing reached Maven Central and nothing appeared in the Central Portal. Gradle's built-in maven-publish plugin only performs Maven-style PUTs, which the OSSRH Staging API compatibility service collects into an implicit staging repository. Per Sonatype's docs for that service, maven-publish users must call the manual transfer endpoint afterwards or the deployment is never handed to the Portal:

https://central.sonatype.org/publish/publish-portal-ossrh-staging-api/#ensuring-deployment-visibility-in-the-central-publisher-portal

publishing_type=automatic additionally releases to Maven Central as soon as validation passes, so no Portal click is needed.

Reviewer notes

• Same job, on purpose. The service resolves the default repository by namespace plus the client IP that uploaded. Each matrix job runs on its own runner, so the transfer has to happen inside that job. A separate trailing job would find nothing.
• curl --fail-with-body makes the job fail visibly if the transfer or Portal validation is rejected, which the previous run lacked.
• deployment_name is set to <project>-<run number> so the four parallel deployments are distinguishable in the Portal.
• The four repositories left behind by tonight's run remain on the staging service under the CI account. They are harmless, but can be dropped later via DELETE /manual/drop/repository/<key> with that account's token.
• After merging, re-run Publish All Libraries Release from master. 1.1.1 is not yet on Central, so re-uploading is safe.

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