Skip deleting the branch in the upstream of a forkerd repo

src/classes/issues-processor.ts

@@ -921,6 +921,12 @@ export class IssuesProcessor {
     }
 
     const branch = pullRequest.head.ref;
+
+    if (
+      pullRequest.head.repo === null ||
+      pullRequest.head.repo.full_name ===
+        `${context.repo.owner}/${context.repo.repo}`
+    ) {
       issueLogger.info(
         `Deleting the branch "${LoggerService.cyan(branch)}" from closed $$type`
       );
@@ -943,6 +949,15 @@ export class IssuesProcessor {
           )}" from $$type: ${error.message}`
         );
       }
+    } else {
+      issueLogger.warning(
+        `Deleting the branch "${LoggerService.cyan(
+          branch
+        )}" has skipped because it belongs to other repo ${
+          pullRequest.head.repo.full_name
+        }`
+      );
+    }
   }
 
   // Remove a label from an issue or a pull request

src/interfaces/pull-request.ts

@@ -2,6 +2,9 @@ export interface IPullRequest {
   number: number;
   head: {
     ref: string;
+    repo: {
+      full_name: string;
+    } | null;
   };
   draft?: boolean;
 }