Add Github wehbook management

Change-Id: I4b7a23a77838f345d65adf51877fab5978bd6055
diff --git a/server/tm/git_tm/git_task_manager.go b/server/tm/git_tm/git_task_manager.go
index 2e9fce3..a49a866 100644
--- a/server/tm/git_tm/git_task_manager.go
+++ b/server/tm/git_tm/git_task_manager.go
@@ -1103,7 +1103,7 @@
 		cleanTitle = cleanTitle[:40]
 	}
 
-	return fmt.Sprintf("%s%s-%s", prefix, task.ID, cleanTitle)
+	return fmt.Sprintf("%s/%s-%s", prefix, task.ID, cleanTitle)
 }
 
 // buildSolutionPRDescription creates PR description from template