Use GitHub Actions for CI/CD

[jpdillingham]

I'm in the process of migrating all of the pipelines for open source repos I contribute to over to GitHub actions.

Circle CI is actually great, but there's no reason to use it over GitHub Actions and I'd prefer to manage as few CI/CD platforms as possible.

[jpdillingham]

I forgot about all of the Circle CI specific stuff in /bin/ci; that will need to be refactored to allow Sonar Scanner to be configured properly running under Actions before the pipeline can be switched over.