Add github action to close stale issues and prs (#655)

.github/workflows/stale.yaml

@@ -0,0 +1,29 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+env:
+  DAYS_BEFORE_ISSUE_STALE: 45
+  DAYS_BEFORE_ISSUE_CLOSE: 14
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v8
+        with:
+          days-before-issue-stale: ${{ env.DAYS_BEFORE_ISSUE_STALE }}
+          days-before-issue-close: ${{ env.DAYS_BEFORE_ISSUE_CLOSE }}
+          days-before-pr-stale: ${{ env.DAYS_BEFORE_ISSUE_STALE }}
+          days-before-pr-close: ${{ env.DAYS_BEFORE_ISSUE_CLOSE }}
+          stale-issue-label: "Inactive Issue"
+          stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          stale-pr-message: 'This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 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 10 days with no activity.'
+          exempt-issue-labels: "Active Issue"
+          repo-token: ${{ secrets.GITHUB_TOKEN }}