chore: Add stale pipeline

.gitea/workflows/stale.yml

@@ -0,0 +1,13 @@
+name: "Close stale issues and PRs"
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: "Message to comment on stale issues. If none provided, will not mark issues stale"
+          stale-pr-message: "Message to comment on stale PRs. If none provided, will not mark PRs stale"