Create stale.yml (#1007)

Signed-off-by: davidliu <david-khala@hotmail.com>

.github/workflows/stale.yml

@@ -0,0 +1,29 @@
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+  - cron: "0 0 * * 0"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/stale@v3
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'Marked as stale issue. Will be closed later if no activity for a while. '
+        stale-pr-message: 'Marked as stale PR. Will be closed later if no activity for a while.'
+        stale-issue-label: 'no-issue-activity'
+        stale-pr-label: 'no-pr-activity'
+        # The labels to apply when an issue is exempt from being marked stale. Separate multiple labels with commas (eg. "label1,label2")
+        exempt-issue-labels: ''
+        
+        # The labels to apply when a pull request is exempt from being marked stale. Separate multiple labels with commas (eg. "label1,label2")
+        exempt-pr-labels: ''
+        
+        # The number of days old an issue can be before marking it stale. Set to -1 to never mark issues or pull requests as stale automatically.
+        days-before-stale: 90
+        # The number of days to wait to close an issue or pull request after it being marked stale. Set to -1 to never close stale issues.
+        days-before-close: 45