Action to auto-close stale issues and PRs (#2051)

Author: JoshMock

.github/workflows/stale.yml

@@ -0,0 +1,21 @@
+---
+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-label: stale
+          stale-pr-label: stale
+          days-before-stale: 90
+          days-before-close: 14
+          exempt-issue-labels: 'good first issue'
+          close-issue-label: closed-stale
+          close-pr-label: closed-stale
+          stale-issue-message: 'This issue is stale because it has been open 90 days with no activity. Remove the `stale` label, or leave a comment, or this will be closed in 14 days.'
+          stale-pr-message: 'This pull request is stale because it has been open 90 days with no activity. Remove the `stale` label, or leave a comment, or this will be closed in 14 days.'