ci: 🎡 add stale issues workflow + actionlint (#802)

.github/workflows/reviewdog.yml

@@ -0,0 +1,16 @@
+name: reviewdog
+
+on:
+  pull_request:
+    paths:
+      - '.github/**/*.yml'
+
+jobs:
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: reviewdog/action-actionlint@v1
+        with:
+          fail_on_error: true

.github/workflows/stale-issues.yml

@@ -0,0 +1,15 @@
+name: Mark stale issues
+on:
+  schedule:
+    - cron: '30 1 * * *'  # Runs daily at 01:30 UTC
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: 'This issue is missing information/reproduction for 3 weeks with no activity. Please provide the required information/reproduction or this issue will be closed in 7 days.'
+          days-before-stale: 21
+          only-labels: 'Missing reproduction,Missing information'
+          days-before-pr-stale: -1  # Exclude PRs
+          days-before-pr-close: -1  # Exclude PRs