Add new solution add_label.yml

Author: Charles Li

.github/workflows/AddLabel.yml

@@ -41,7 +41,6 @@ jobs:
             if (context.payload.pull_request !== undefined) {
               pull_number = context.payload.pull_request.number
             } else if (context.payload.workflow_run !== undefined) {
-              workflow_name = context.payload.workflow_run.name
               if (context.payload.workflow_run.pull_requests.length === 0) {
                 console.log("This workflow is NOT running within a PR's context")
                 process.exit(1)