fix additional requirement in unit test pip install

.github/workflows/build.yaml

@@ -27,6 +27,6 @@ jobs:
             pip install -U setuptools
             pip install -r requirements.txt
             pip install -r requirements-test.txt
-            python -m pip install -U --editable
+            python -m pip install -U --editable .
       - name: Test with pytest
         run: pytest -vs tests/ --cov orbit/