enable oauth with a login botton

app.py

@@ -86,25 +86,25 @@ model_card = ModelCard(
 
 # Build Gradio interface with dropdowns for model and stem selection
 with gr.Blocks() as demo:
-    components = [
-        gr.Dropdown(
-            label="Select Demucs Model",
-            choices=DEMUX_MODELS,
-            value="mdx_extra_q"
-        ),
-        gr.Dropdown(
-            label="Select Stem to Separate",
-            choices=list(STEM_CHOICES.keys()),
-            value="Vocals"
+    # Add the built-in LoginButton to let users sign in with their HF account.
+    gr.LoginButton()
 
-        )
-    ]
+    dropdown_model = gr.Dropdown(
+        label="Select Demucs Model",
+        choices=DEMUX_MODELS,
+        value="mdx_extra_q"
+    )
+    dropdown_stem = gr.Dropdown(
+        label="Select Stem to Separate",
+        choices=list(STEM_CHOICES.keys()),
+        value="Vocals"
+    )
 
     app = build_endpoint(
         model_card=model_card,
-        components=components,
+        components=[dropdown_model, dropdown_stem],
         process_fn=process_fn_stem
     )
 
 demo.queue()
-demo.launch(share=True, show_error=True)
+demo.launch(show_error=True)