GitHub Meta: Add stale issue auto-bot.

Author: jhuckaby

.github/workflows/stale-issues.yml

@@ -0,0 +1,40 @@
+name: Close stale issues
+
+on:
+  schedule:
+    - cron: "17 3 * * *"
+  workflow_dispatch:
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+
+    permissions:
+      issues: write
+      pull-requests: write
+
+    steps:
+      - uses: actions/stale@v10
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+
+          # Issues only
+          days-before-issue-stale: 7
+          days-before-issue-close: 3
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+
+          stale-issue-label: stale
+          stale-issue-message: >
+            This issue has had no activity for 7 days, so it is being marked stale.
+            If there is still no follow-up in 3 more days, it will be closed automatically.
+          close-issue-message: >
+            Closing this issue because it has been stale for 3 days with no further activity.
+
+          # Never touch enhancements
+          exempt-issue-labels: enhancement
+
+          # Never touch assigned issues
+          exempt-all-issue-assignees: true
+
+          operations-per-run: 200