Docs 2.1 ci use the cuda 10.2 as its basement (#3541)

* install paddle 2.1.0 on release/2.1 branch

* using cuda 10.2

* ubuntu 18.04 python3.8 should install setuptools module

* install setuptools

ci_scripts/Dockerfile

@@ -1,4 +1,4 @@
-ARG BASEIMAGE=registry.baidubce.com/paddleopen/paddle:build-gpu-cuda11.2.2-cudnn8-devel-ubuntu20.04-gcc8
+ARG BASEIMAGE=registry.baidubce.com/paddleopen/paddle:build-gpu-cuda10.2-cudnn8-devel-ubuntu18.04-gcc8
 FROM ${BASEIMAGE}
 
 RUN git config --global user.name "PaddleCI" \
@@ -15,6 +15,7 @@ RUN apt-get update \
  && rm -rf /var/lib/apt/lists/*
 
 # ci's requirements
+RUN pip3 install --no-cache-dir -i https://mirror.baidu.com/pypi/simple setuptools
 RUN echo 'docutils\n\
 scipy\n\
 prettytable\n\

ci_scripts/check_api_cn.sh

@@ -3,7 +3,11 @@ set -x
 
 function install_paddle() {
     # try to download paddle, and install
-    pip install https://paddle-fluiddoc-ci.bj.bcebos.com/python/dist/paddlepaddle_gpu-0.0.0-cp38-cp38-linux_x86_64.whl
+    if [ ${BRANCH} = 'release/2.1' ] ; then
+        pip install https://paddle-fluiddoc-ci.bj.bcebos.com/python/dist/paddlepaddle_gpu-2.1.0-cp38-cp38-linux_x86_64.whl
+    else
+        pip install https://paddle-fluiddoc-ci.bj.bcebos.com/python/dist/paddlepaddle_gpu-0.0.0-cp38-cp38-linux_x86_64.whl
+    fi
     # if failed, build paddle
     if [ $? -ne 0 ];then
         build_paddle