Allow has_successful_status to consume a wildcard

[ChipWolf]

I'd like a policy that requires all status checks to be passed without defining them individually.

[bluekeyes]

Unfortunately, I'm not sure this is possible to implement in a reliable way. When policy-bot looks at a PR, there's no way that I know of to determine if the current set of statuses is complete or if something will post another status in the future. As a human looking at a PR, you have an expectation of what statuses should exist, but I don't know how to give policy-bot this information without putting the list of statuses in to the policy.

Could you share some more details about the policy you want to implement? Maybe there's a way to achieve something similar without wildcard matching for statuses.