Publish image on GitHub Packages

[PeterDaveHello]

Reasons:

1. Decentralize the image registry, provide more options to the users.
2. Docker Hub now has the image pull limit policy, though not every one will face the issue, as long as you don't need to share IP address with the others, and won't pull too many images in a limited time. The easy approach to mitigate the issue seem to authenticate the identity when pulling an image, but may not be a very good choice for privacy concerned users.

Reference:

• Publishing images to GitHub Packages