Auto close stale issues / PRs

.github/workflows/stale.yml

@@ -0,0 +1,23 @@
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+  - cron: "0 0 * * *"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/stale@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'This issue is stale because it has been open for 120 days with no activity. Remove the `stale` label or comment or this will be closed in 15 days'
+        stale-pr-message: 'This pull request is stale because it has been open 30 days with no activity. Remove the `stale` label or comment on this issue, or it will be closed in 15 days'
+        stale-issue-label: 'stale'
+        stale-pr-label: 'stale'
+        days-before-stale: 120
+        days-before-close: 15
+        exempt-issue-label: 'pinned'
+        exempt-pr-label: 'pinned'