releases should push images to hub, quay, github

[jzelinskie]

authzed/actions has some utilities for publishing to all of our registry targets that we should be using (docker hub gets most of our traffic)

[teancom]

+1 (As someone who noticed that playground hasn't been updated on ghcr.io since mid-2024 and has never been pushed to quay or hub.)

❯ podman images | grep spice
quay.io/authzed/spicedb                                                                latest                 adc474f280af  9 days ago     99.8 MB
ghcr.io/authzed/spicedb-playground                                                     latest                 c00113981ab8  15 months ago  316 MB