ci: add labels sync, release and stale workflows

.github/workflows/labels.yml

@@ -0,0 +1,15 @@
+name: Sync labels
+on:
+  workflow_dispatch:
+permissions:
+  issues: write
+jobs:
+  labels:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: EndBug/label-sync@v2
+        with:
+          config-file: 'https://raw.githubusercontent.com/thetutlage/static/main/labels.yml'
+          delete-other-labels: true
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/stale.yml

@@ -0,0 +1,17 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 0 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: 'This issue has been marked as stale because it has been inactive for more than 21 days. Please reopen if you still need help on this issue'
+          stale-pr-message: 'This pull request has been marked as stale because it has been inactive for more than 21 days. Please reopen if you still intend to submit this pull request'
+          close-issue-message: 'This issue has been automatically closed because it has been inactive for more than 4 weeks. Please reopen if you still need help on this issue'
+          close-pr-message: 'This pull request has been automatically closed because it has been inactive for more than 4 weeks. Please reopen if you still intend to submit this pull request'
+          days-before-stale: 21
+          days-before-close: 5