Add method to delete Workflow runs (#2078)

One piece of missing functionality is the ability to delete Workflow
Runs, which the GitHub API supports. Add a delete() method to
WorkflowRun.

Fixes #2019

github/WorkflowRun.py

@@ -243,6 +243,14 @@ class WorkflowRun(github.GithubObject.CompletableGithubObject):
         timingdata = namedtuple("TimingData", data.keys())
         return timingdata._make(data.values())
 
+    def delete(self):
+        """
+        :calls: `DELETE /repos/{owner}/{repo}/actions/runs/{run_id} <https://docs.github.com/en/rest/reference/actions#workflow-runs>`_
+        :rtype: bool
+        """
+        status, _, _ = self._requester.requestJson("DELETE", self.url)
+        return status == 204
+
     def _initAttributes(self):
         self._id = github.GithubObject.NotSet
         self._head_branch = github.GithubObject.NotSet

tests/WorkflowRun.py

@@ -105,3 +105,7 @@ class WorkflowRun(Framework.TestCase):
 
     def test_cancel(self):
         self.assertTrue(self.workflow_run.cancel())
+
+    def test_delete(self):
+        wr = self.repo.get_workflow_run(1327550476)
+        self.assertTrue(wr.delete())