Added back in the package install step

Author: Sevhena

.github/workflows/package-build.yaml

@@ -31,6 +31,10 @@ jobs:
           python -m pip install --upgrade pip
           pip install build pyinstaller
 
+      - name: Install package
+        run: |
+          pip install .
+
       - name: Build Python package
         run: |
           python -m build