Modify stale PR workflow for labeled events

.github/workflows/stale_pr_close.yml

@@ -1,8 +1,11 @@
 name: Stale PR Management
 on:
   schedule:
-    - cron: "0 0 * * *"  # Daily at midnight UTC
+    - cron: "0 0 * * *"
-  workflow_dispatch:      # Allow manual trigger for testing
+  workflow_dispatch:
+  pull_request_target:  # Changed from pull_request
+    types:
+      - labeled
 
 jobs:
   stale-prs:
@@ -12,7 +15,7 @@ jobs:
       issues: write
       contents: read
     steps:
-      - name: Handle stale PRs
+      - name: Handle stale label
         uses: actions/github-script@v7
         with:
           script: |
@@ -20,6 +23,21 @@ jobs:
             const owner = context.repo.owner;
             const repo = context.repo.repo;
             
+            // --- PR labeled event ---
+            if (context.eventName === "pull_request_target" && context.payload.action === "labeled") {
+              const label = context.payload.label?.name;
+              if (label === "stale") {
+                await github.rest.issues.createComment({
+                  owner,
+                  repo,
+                  issue_number: context.payload.pull_request.number,
+                  body: "This PR has been marked as stale. It will be closed if no new commits are added in 7 days."
+                });
+              }
+              return;
+            }
+            
+            // --- Scheduled run ---
             const { data: prs } = await github.rest.pulls.list({
               owner,
               repo,