Update python-package.yml

Author: katiebreivik

.github/workflows/python-package.yml

@@ -3,7 +3,7 @@
 
 name: Unit Test COSMIC
 
-on: [pull_request]
+on: [pull_request, push]
 
 jobs:
   build:
@@ -34,6 +34,7 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get install gfortran swig libhdf5-serial-dev
+        pip install numpy
         pip install -r requirements.txt
         pip install .
     - name: Lint with flake8