add stale github action to close stale issues/prs (#1743)

.github/workflows/stale.yaml

@@ -0,0 +1,20 @@
+name: "Close stale issues/prs"
+on:
+ schedule:
+ - cron: "0 0 * * *"
+
+jobs:
+ stale:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/stale@v1.1.0
+ with:
+ repo-token: ${{ secrets.GITHUB_TOKEN }}
+ stale-issue-message: 'This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 15 days'
+ stale-pr-message: 'This pr is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 15 days'
+ days-before-stale: 60
+ days-before-close: 15
+ stale-issue-label: 'lifecycle/stale'
+ stale-pr-label: 'lifecycle/stale'
+ exempt-issue-label: 'lifecycle/frozen'
+ exempt-pr-label: 'lifecycle/frozen'