Create stale.yml

.github/workflows/stale.yml

@@ -0,0 +1,30 @@
+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 has been automatically marked as stale because it has not had
+          recent activity. It will be closed if no further activity occurs.
+          Thank you for your contributions.
+        stale-pr-message: |
+          This pull request has been automatically marked as stale because it has not had
+          recent activity. It will be closed if no further activity occurs.
+          Thank you for your contributions.
+        stale-issue-label: 'stale'
+        exempt-issue-label: 'pinned'
+        stale-pr-label: 'stale'
+        exempt-pr-label: 'pinned'
+        days-before-stale: 90
+        days-before-close: 14
+        operations-per-run: 5