added build command to test CI

Author: bbcho

.github/workflows/ci.yml

@@ -22,7 +22,8 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install flake8 pytest
+          pip install flake8 pytest cython numpy setuptools
+          python setup.py build_ext --inplace
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - name: Lint with flake8
         run: |