chore: add stale handling for issues and prs (#340)

.github/workflows/cleanup-action-caches.yml

@@ -1,4 +1,4 @@
-name: cleanup gh actions caches
+name: Cleanup GH Actions Caches
 on:
   pull_request:
     types:

.github/workflows/stale-handling.yml

@@ -0,0 +1,22 @@
+name: Close Stale Issues and PRs
+on:
+  schedule:
+    - cron: '30 2 * * *'
+
+permissions:
+    issues: write
+    pull-requests: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v8
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 15 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          stale-pr-message: 'This pull request is stale because it has been open 15 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          close-issue-message: 'This issue was closed because it has been stalled for 5 days with no activity.'
+          close-pr-message: 'This PR was closed because it has been stalled for 5 days with no activity.'
+          days-before-stale: 15
+          days-before-close: 5
+          any-of-issue-labels: 'needs-author-feedback'