Update python-app.yml

.github/workflows/python-app.yml

@@ -28,6 +28,9 @@ jobs:
         python -m pip install --upgrade pip
         pip install flake8 pytest
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Make the script executable
+      run: |
+        chmod +x ./notebooks/scripts/run_app.sh
     - name: Run the app 
       run: |
         ./notebooks/scripts/run_app.sh