Update dockerfile

Dockerfile

@@ -28,4 +28,4 @@ COPY --chown=user . $HOME/app
 # For environments with multiple CPU cores, increase the number of workers
 # to be equal to the cores available.
 # Timeout is set to 0 to disable the timeouts of the workers to allow Cloud Run to handle instance scaling.
-CMD exec gunicorn --bind :$PORT --workers 1 --threads 8 --timeout 0 main:app
+CMD exec gunicorn --bind 0.0.0.0:7860 --workers 1 --threads 8 --timeout 0 main:app