Add a stale action for maintaining inactive issues/PRs

Author: cderici

.github/workflows/stale.yaml

@@ -0,0 +1,24 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v8
+        with:
+          stale-issue-message: 'This issue is marked as incomplete because it has been open 30 days with no activity. Please remove incomplete label or comment or this will be closed in 5 days.'
+          stale-pr-message: 'This PR is marked as incomplete because it has been open 30 days with no activity. Please remove incomplete label or comment or this will be closed in 5 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.'
+          days-before-issue-stale: 30
+          days-before-pr-stale: 30
+          days-before-issue-close: 5
+          days-before-pr-close: 5
+          stale-issue-label: 'incomplete'
+          stale-pr-label: 'incomplete'
+          exempt-issue-labels: 'awaiting-approval,work-in-progress'
+          exempt-pr-labels: 'awaiting-approval,work-in-progress'
+          remove-stale-when-updated: true