Create issue when links are broken.

Also add workflow_dispatch to be able to trigger workflow nanually.
Decrease frequency of cron scheduler to once a month. Add date to the
title of the issue.

.github/workflows/markdown-link-check.yml → .github/workflows/link-check.yml

@@ -1,14 +1,19 @@
-name: markdown-link-check
+name: link-check
 
 on:
+  workflow_dispatch:
   push:
     branches:
     - main
   pull_request:
     branches:
     - main
   schedule:
-    - cron: '0 0 * * 0' # every Sunday at 00:00
+    - cron: '0 0 1 * *' # first day of every month at midnight
+
+permissions:
+  contents: read
+  issues: write
 
 jobs:
   linkChecker:
@@ -19,15 +24,15 @@ jobs:
       - name: Link Checker
         id: lychee
         uses: lycheeverse/lychee-action@v1
-        with:
-          # fail action if there are broken links
-          fail: true
+
+      - name: Set Issue Title
+        id: set_title
+        run: echo "ISSUE_TITLE=Link Checker Report - $(date '+%Y-%m-%d')" >> $GITHUB_ENV
 
       - name: Create Issue From File
-        # create issues only when triggered by schedule
-        if: github.event_name == 'schedule' && env.lychee_exit_code != 0
+        if: env.lychee_exit_code != 0
         uses: peter-evans/create-issue-from-file@v5
         with:
-          title: Link Checker Report
+          title: ${{ env.ISSUE_TITLE }}
           content-filepath: ./lychee/out.md
           labels: report, automated issue