update PR link checker workflow

.github/workflows/link-checker-pr.yml

@@ -1,28 +1,38 @@
 name: Link Checker for Pull requests
 on: pull_request
 jobs:
+  changedFiles:
+    runs-on: ubuntu-latest
+    outputs:
+      files: ${{ steps.changed-markdown-files.outputs.all_changed_files }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Get changed markdown files
+        id: changed-markdown-files
+        uses: tj-actions/changed-files@v45
+        with:
+          # Avoid using single or double quotes for multiline patterns
+          files: |
+             **.md
+          matrix: true
+
   linkChecker:
     runs-on: ubuntu-latest
+    needs: changedFiles
+    if: ${{ needs.changedFiles.outputs.files != '' && toJSON(fromJSON(needs.changedFiles.outputs.files)) != '[]' }}
+    strategy:
+      matrix:
+        file: ${{ fromJSON(needs.changedFiles.outputs.files) }}
+      fail-fast: false
     steps:
-      - uses: actions/checkout@v3
-      - id: changed_files
-        uses: jitterbit/get-changed-files@v1
-      - name: Link Checker
-        uses: lycheeverse/[email protected]
-        id: lychee
-        env:
-          GITHUB_TOKEN: ${{secrets.TOKEN_GITHUB}}        
+      - uses: actions/checkout@v4
         with:
-          args: ${{ steps.changed_files.outputs.all }}
-      - name: Count broken links
+          fetch-depth: 2
+      - name: download Lychee
+        run: |
+          wget https://github.com/lycheeverse/lychee/releases/download/nightly/lychee-x86_64-unknown-linux-gnu.tar.gz
+          tar xzf lychee-x86_64-unknown-linux-gnu.tar.gz
+      - name: Check all this file's additions for broken links
         run: |
-            broken_max=10
-            broken_count=$(printf "%d" $(grep "🚫 Errors" lychee/out.md | cut -d'|' -f3))
-            if [ "$broken_count" -gt "$broken_max" ]; then
-                echo "Number of broken links (${broken_count}) exceeds maximum allowed number (${broken_max})."
-                cat lychee/out.md
-                exit 1
-            else
-                echo "Number of broken links (${broken_count}) less than or equal to maximum allowed number (${broken_max})."
-                exit 0
-            fi
+          export base_sha=$(git rev-parse ${{ github.sha }}^)
+          git diff -U0 ${base_sha} ${{ github.event.pull_request.head.sha }} -- ${{ matrix.file }} | grep -v "+++" | grep "^+" | cut -c 2- | ./lychee -