update link checker to update existing issues

.github/workflows/links-watcher-cron.yml

@@ -23,10 +23,22 @@ jobs:
           output: ./lychee/out.md
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
-      - name: Create issue when fail
+      - name: Find existing issue
+        id: find_issue
+        uses: micalevisk/last-issue-action@v2
+        if: ${{ steps.lychee.outputs.exit_code }} != 0
+        with:
+          state: open
+          labels: |
+            broken link
+            automated issue      
+      - name: Create or update issue for broken links
         uses: peter-evans/create-issue-from-file@v4
         if: ${{ steps.lychee.outputs.exit_code }} != 0
         with:
           title: Link Checker Report
+          # If issue number is empty a new issue gets
+          issue-number: ${{ steps.find_issue.outputs.issue-number }}
           content-filepath: ./lychee/out.md
           labels: broken link, automated issue
+