Wait to announce the release if it is not available in Maven Central yet

Even though our release process may have finished, it can take some time after that before Maven Central is able to serve the artifacts published. It would be ideal if the post-release workflow polls Maven Central to ensure that artifacts for the released version are already available before making the release announcement. Typically it does not take more than 10-20 minutes for artifacts to be available, but we may run into timeout issues with such a long-running action polling Maven Central.

Start by locating the post-release workflow and reviewing how it currently announces releases and handles action timeouts. Check Maven Central for the released version's artifacts and define completion as announcing only after they are available, while keeping the workflow from waiting indefinitely.

Written by the indexing model from the issue text.