Update python-app.yml

Author: Rob-Welch

.github/workflows/python-app.yml

@@ -52,6 +52,10 @@ jobs:
           conda info
           conda list
 
+      - name: install with pip
+        shell: bash -l {0}
+        run: pip install -e .
+
       - name: Run test suite
         shell: bash -l {0}
         run: pytest -v