Automagically manage pull requests (infra) (#2068)

Author: Hook25

.github/workflows/stale.yaml

@@ -0,0 +1,28 @@
+name: 'Close stale PRs'
+on:
+  pull_request:
+    branches: [ main ]
+    paths:
+      - .github/workflows/stale.yaml
+  workflow_dispatch:
+  schedule:
+    - cron: '30 1 * * *'
+
+permissions:
+  contents: read
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      issues: write
+    steps:
+      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639
+        with:
+          stale-pr-message: 'This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in a week.'
+          close-pr-message: 'This PR was closed because of inactivity. Feel free to re-open this once you want to work on it again!'
+          days-before-stale: 60
+          days-before-close: 7
+          days-before-issue-stale: -1
+          days-before-issue-close: -1