Publish v2.12.0 or newer to the BCR

With #370 having landed, can someone run the `publish-to-bcr` workflow to publish the `bazel_remote_apis` module? Or is there a new release coming soon (which should trigger this automatically)?

Start with the `publish-to-bcr` workflow and review the context from #370. Determine whether the workflow should publish v2.12.0 or whether an upcoming release will trigger it automatically; done means the `bazel_remote_apis` module is published to the BCR at the appropriate version.

Written by the indexing model from the issue text.