chore: migrate from Probot Stale to GitHub Actions Stale

Author: tangcent

.github/stale.yml

@@ -0,0 +1,30 @@
+name: 'Close stale issues'
+on:
+  schedule:
+    - cron: '0 0 * * *'  # Run daily at midnight
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          days-before-stale: 20
+          days-before-close: 5
+          exempt-issue-labels: 'release,wait-for-release'
+          stale-issue-label: 'wontfix'
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has not had
+            recent activity. It will be closed if no further activity occurs. Thank you
+            for your contributions.
+          close-issue-message: ''  # No close message as per your config
+          # Using the same settings for PRs as issues
+          days-before-pr-stale: 20
+          days-before-pr-close: 5
+          exempt-pr-labels: 'release,wait-for-release'
+          stale-pr-label: 'wontfix'
+          stale-pr-message: >
+            This pull request has been automatically marked as stale because it has not had
+            recent activity. It will be closed if no further activity occurs. Thank you
+            for your contributions.
+          close-pr-message: ''