国内访问 Dockhub 困难，希望增加国内镜像发布地址

**System information** - OS Platform and Distribution (e.g., Linux Ubuntu 20.04): N/A - DeepRec version or commit id: N/A - Python version: N/A - Bazel version (if compiling from source): N/A - GCC/Compiler version (if compiling from source): N/A - CUDA/cuDNN version: N/A **Describe the problem** 目前 DeepRec 下载地址从 DockerHub 拉取，国内用户访问困难。希望在国内增加发布地址。 **Provide the exact sequence of commands / steps that you executed before running into the problem** **Any other info / logs** Include any logs or source code that would be helpful to diagnose the problem.