release docker images to github (in addition to dockerhub)

[avivajpeyi]

Dockerhub images have been giving us some trouble.

I propose pushing images also to github so we can catch when the image-building is failing.
See this

https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry

The github images will show up under Packages