ci: add stale issue workflow (#2595)

.github/workflows/issue-stale.yml

@@ -0,0 +1,25 @@
+# Adapted from vercel/next.js
+name: Issue Stale
+on:
+  workflow_dispatch:
+  schedule:
+    # This runs every day 20 minutes before midnight: https://crontab.guru/#40_23_*_*_*
+    - cron: "40 23 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    if: github.repository_owner == 'shadcn-ui'
+    steps:
+      - uses: actions/stale@v4
+        id: stale-no-repro
+        name: "Close stale issues with no reproduction"
+        with:
+          repo-token: ${{ secrets.STALE_TOKEN }}
+          close-issue-message: "This issue has been automatically closed because it received no activity for a while. If you think it was closed by accident, please leave a comment. Thank you."
+          days-before-issue-close: 1
+          days-before-issue-stale: 15
+          days-before-pr-close: -1
+          days-before-pr-stale: -1
+          exempt-issue-labels: "roadmap,next,bug"
+          operations-per-run: 300 # 1 operation per 100 issues, the rest is to label/comment/close