change in Dockerfile by hardcoding the port

Dockerfile

@@ -19,4 +19,4 @@ COPY main.py .
 
 # 6. Define the command to run your application using Gunicorn
 # This command points to the 'app' object inside your 'main.py' file within the 'app' module.
-CMD ["/bin/sh", "-c", "gunicorn --bind 0.0.0.0:$PORT --workers 1 --worker-class uvicorn.workers.UvicornWorker --timeout 0 \"main:app\""]
+CMD ["/bin/sh", "-c", "gunicorn --bind 0.0.0.0:7860 --workers 1 --worker-class uvicorn.workers.UvicornWorker --timeout 0 \"main:app\""]