fixed issue #801 , support canal docker

docker/Dockerfile

@@ -64,4 +64,4 @@ EXPOSE 2222 11111 8000 8080
 WORKDIR /home/admin
 
 ENTRYPOINT [ "/alidata/bin/main.sh" ]
-CMD [ "/home/admin/app.sh" ]
+CMD [ "/home/admin/app.sh" ]