use pip install .

.github/workflows/python-test-doc.yml

@@ -28,7 +28,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install flake8 pytest coveralls codacy-coverage
-        python -m pip install -r requirements.txt
+        python -m pip install .
         python -m pip install -r doc/requirements.txt
     - name: Lint with flake8
       run: |