added gradio service inside space

Dockerfile

@@ -6,9 +6,10 @@ RUN pip install --no-cache-dir --upgrade -r /app/requirements.txt
 
 ENV HOME=/home/user \
     PATH=/home/user/.local/bin:$PATH \
-    PORT=7860 \
+    D2M_PORT=7860 \
+    GRADIO_PORT=8000 \
     URL_GRADIO=https://rgres-drawing2map.hf.space/
 
 COPY ./static/ ./
 
-CMD ["python",  "app.py"]
+CMD ["python",  "main.py"]

gradio-app.py

@@ -35,6 +35,7 @@ def generate_map(image, prompt, steps, seed):
 
 demo = gr.Interface(
   fn=generate_map,
+  server_port=os.getenv('GRADIO_PORT', '7860'),
   inputs=["image", "text", gr.Slider(0,100), "number"],
   outputs="image")