Does drone currently support, or is it planning to support Google Secret Manager (https://cloud.google.com/secret-manager) as an extensions like https://docs.drone.io/extensions/secret/?
We created a few reference extensions, however, our expectation is that going forward new extensions will come from the community. Anyone can create an extension and we even provide a starter project to help you get up and running quickly. See https://github.com/drone/boilr-secret
If you need any help or have any questions creating an extension let us know. We can also add links to community extensions in the official Drone docs.