Add link checker GH Action

Author: KristinaRiemer

.github/workflows/links.yml

@@ -0,0 +1,29 @@
+# action: https://github.com/lycheeverse/lychee-action
+# lychee: https://github.com/lycheeverse/lychee
+
+name: Links
+
+on:
+  pull_request:
+  workflow_dispatch:
+  schedule:
+  #first of every month
+    - cron: "0 0 1 * *"
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Link Checker
+        id: lychee
+        uses: lycheeverse/lychee-action@v1
+
+      - name: Create Issue From File
+        if: ${{ failure() && github.event_name != 'pull_request' }}
+        uses: peter-evans/create-issue-from-file@v5
+        with:
+          title: Link Checker Report
+          content-filepath: ./lychee/out.md
+          labels: report, automated issue