Renable GitHub Packages

[keithrfung]

Feature Request

Is your feature request related to a problem? Please describe.
GitHub Packages was removed due to its tendency to block builds with no configuration changes.

Describe the solution you'd like

Use GitHub Workflow

- name: Push to GitHub Package Registry	
      run: dotnet nuget push src/ElectionGuard/bin/Release/*.nupkg --source "github"

Describe alternatives you've considered
NuGet.org is already used. This is just to add to the existing functionality.