Add docker specific changes

Dockerfile

@@ -1,7 +1,7 @@
 # read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
 # you will also find guides on how best to write your Dockerfile
 
-FROM python:3.9
+FROM python:3.12
 
 RUN useradd -m -u 1000 user
 
@@ -15,4 +15,4 @@ COPY --chown=user . /app
 
 EXPOSE 7860
 
-CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:7860", "app:server"]
+CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:7860", "app:server"]

app.py

@@ -107,5 +107,8 @@ dashboard = vm.Dashboard(
     ),
 )
 
-if __name__ == "__main__":
-    Vizro().build(dashboard).run()
+app = Vizro().build(dashboard)
+server = app.dash.server
+
+if __name__ == "__main__":  
+    app.run()