ci : add github action/stale to automatically flag and close inactive issues

.github/workflows/stale.yml

@@ -0,0 +1,60 @@
+name: "Lifecycle: Mark and close stale issues"
+
+on:
+  schedule:
+    - cron: "0 2 * * *" # Run every day at 02:00 UTC
+  workflow_dispatch:
+
+permissions:
+  issues: write
+  pull-requests: write
+  contents: read
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v10
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+
+          # --- Issue configuration ---
+          stale-issue-label: "lifecycle/stale"
+          exempt-issue-labels: "lifecycle/frozen"
+          remove-issue-stale-when-updated: true
+          days-before-issue-stale: 180
+          days-before-issue-close: 7
+          stale-issue-message: >
+            This issue has been automatically marked as stale due to 180 days of inactivity.
+
+            If this issue is still relevant, please add a comment to keep it open.
+
+            Otherwise, it will be closed after 7 more days of inactivity.
+
+            Moderators: Add the `lifecycle/frozen` label to exempt this issue from the stale process.
+          close-issue-message: >
+            Closing this issue as it remained inactive after being marked `lifecycle/stale`.
+
+          # --- PR configuration ---
+          stale-pr-label: "lifecycle/stale"
+          exempt-pr-labels: "lifecycle/frozen"
+          remove-pr-stale-when-updated: true
+          exempt-draft-pr: false
+          days-before-pr-stale: 180
+          days-before-pr-close: 7
+          stale-pr-message: >
+            This pull request has been automatically marked as stale due to 180 days of inactivity.
+
+            Please update it or comment if you intend to continue working on it.
+
+            It will be closed after 7 more days of inactivity.
+
+            Moderators: Add the `lifecycle/frozen` label to exempt this PR from the stale process.
+          close-pr-message: >
+            Closing this pull request as it remained inactive after being marked `lifecycle/stale`.
+
+          # --- Shared settings ---
+          labels-to-remove-when-unstale: "lifecycle/stale"
+          sort-by: "created"
+          start-date: "2025-11-03T00:24:55Z"
+          operations-per-run: 100