check_run event support

[urkle]

Now that peril is running under github's "check" system it would be nice to support the check_run.rerequested event/action.

This payload provides a list of pull requests, so it should be simple enough to map those to pull_request.recheck or something like that

abbreviated check_suite.rerequested payload

{
  "action": "rerequested",
  "check_run": {
    // other misc data
    "name": "Danger",
    "check_suite": {
       // check suite data
    },
    "app": {
      // app info
    },
    "pull_requests": [
      // list of pull requests to be retried
      {
        // pull request data
        "number": 2754,
        "head": {
          // head ref data
        },
        "base": {
          // base ref data
        }
      }
    ]
  },
  "repository": {
    // repository details
  },
  "organization": {
    // org details
  },
  "sender": {
    // sender details
  },
  "installation": {
    "id": 12345
  }
}

[orta]

Yeah, I've been wondering about that - maybe have it trigger an automatic run of all pull_request checks so that it doesn't require custom code.

[urkle]

@orta which function(s) would you suggest I process and "fake" that? as I'll create some PRs for this thing as right now this and the milestone issue are hurting us.. so I'm motivated to get it fixed :)