GitHub Actions doesn't publish images to Docker Hub

[tysg]

Looks like the publish step in the GH Actions pipeline is skipped, see workflow. I believe this is because that step is only triggered when a new tag is created.

Could @softprops (or the maintainers, if any) push a new tag for the current master branch? Or, maybe merging #90 will work too. We could all benefit from having a central location to pull the image from, instead of publishing to our own Docker Hub repos, so that GitHub Actions can hold the image cache for everyone a little longer.