add a daily link check

.github/workflows/links.yml

@@ -0,0 +1,25 @@
+name: Check links
+
+on:
+  schedule:
+    - cron: '42 04 * * *'
+
+jobs:
+  check-links:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Lychee Link Checker
+        id: lychee
+        uses: lycheeverse/lychee-action@v1.5.0
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+
+      - name: Create Issue From File
+        if: steps.lychee.outputs.exit_code != 0
+        uses: peter-evans/create-issue-from-file@v3
+        with:
+          title: Link Checker Report
+          content-filepath: ./lychee/out.md
+          labels: report, automated