Add Stale Action workflow for automatic closing of outdated issues

.github/workflows/stale.yml

@@ -0,0 +1,38 @@
+# Stale Action
+
+# This action automatically closes old issues to maintain repository cleanup
+# Exemptions: Issues with milestones or labels 'ref/IP', 'ref/NP' are skipped.
+# days-before-issue-stale: Days until issue gets 'stale' label
+# days-before-issue-close: 0: Issues are closed immediately after being labeled stale
+# operations-per-run: 15: Max ~5 issues processed per run (3 operations each)
+# ascending: true: Processes oldest issues first
+# ignore-issue-updates: true: Closes issues regardless of recent activity
+# debug-only: action only simulates the labeling and closing process, useful for testing
+# Reopen: Automatically closed issues must be manually reopened if still relevant, and the 'stale' label removed to prevent reprocessing.
+
+name: 'stale'
+
+permissions:
+  issues: write
+
+on:
+  schedule:
+    - cron: 0 13 * * 1-5
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          close-issue-message: 'This issue has been automatically closed due to age/inactivity. If still relevant with current software version, feel free to create a new issue with updated details. '
+          stale-issue-label: 'stale'
+          exempt-issue-labels: 'ref/IP, ref/NP'
+          exempt-all-issue-milestones: true
+          days-before-issue-stale: 1780
+          days-before-issue-close: 0
+          operations-per-run: 15
+          enable-statistics: true
+          ignore-issue-updates: true
+          ascending: true
+          debug-only: true