build: tweak action

Author: paul-watkins-croud

.github/workflows/main.yml

@@ -19,7 +19,9 @@ jobs:
           python-version: "3.x"
 
       - name: deps
-        run: python -m pip install -U build
+        run: |
+          python -m pip install -U build pipenv 
+          pipenv install
 
       - name: build
         run: python -m build