Add artifact upload

.github/workflows/pull-request.yml

@@ -55,3 +55,10 @@ jobs:
 
         - name: Run pyinstaller
           run: pyinstaller horus-gui_win.spec
+
+        - name: Upload Artifact
+          uses: actions/upload-artifact@v4
+          with:
+            name: built-executable
+            path: dist/horus-gui.exe
+            retention-days: 2