fix(ci) fix checking if the git repository is clean

.github/workflows/ci.yml

       with:
         node-version: '12.x'
     - run: npm install
-    - run: git status -s --untracked-files=no
+    - name: Check if the git repository is clean
+      run: exit $( git status --porcelain --untracked-files=no | head -255 | wc -l )
     - run: npm run lint
     - run: make