fix: remove actions/checkout to avoid Node.js dependency

.gitea/workflows/pr-review.yml

@@ -8,19 +8,14 @@ jobs:
   review:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout PR branch
-        uses: actions/checkout@v4
-        with:
-          ref: ${{ github.head_ref }}
-          fetch-depth: 0
-
       - name: Get base branch
         run: git fetch origin ${{ github.base_ref }}:${{ github.base_ref }}
 
       - name: Get PR diff
         id: diff
         run: |
-          git diff origin/${{ github.base_ref }}..HEAD > /tmp/pr_diff.txt
+          git config --global --add safe.directory /__w/tftsr-devops_investigation/tftsr-devops_investigation
+          git diff origin/${{ github.base_ref }}..${{ github.head_ref }} > /tmp/pr_diff.txt
           echo "diff_size=$(wc -l < /tmp/pr_diff.txt)" >> $GITHUB_OUTPUT
 
       - name: Analyze with Ollama