Migrate to GitHub Container Registry

[georg-schwarz]

Currently, we are using the GitHub packages, which requires an access key. This makes it hard to pull images...

[Shady-Hegazy]

For everybody to be on the same page, It concerns this:
https://github.community/t/docker-pull-from-public-github-package-registry-fail-with-no-basic-auth-credentials-error/16358/8