Now that GitHub have moved their documentation from
developer.github.com, we should update our links. I have also tried to
update the call strings to their new format, but since it was done via
regex, some of them may not match exactly.
To build on the previous work supporting querying Workflows for GitHub
Actions, add a class and relevant methods to support querying runs of a
workflow.
To start supporting GitHub Actions, add the first part of that,
Workflow, which encapsulates a workflow over the API, along with
two methods on Repository to query them.