make docker build command for building prodction image more precise

doc/getstarted/build_and_install/docker_install_cn.rst

@@ -155,7 +155,7 @@ PaddlePaddle Book是为用户和开发者制作的一个交互式的Jupyter Node
 
    .. code-block:: bash
       
-      docker build -t paddle:prod -f build/Dockerfile .
+      docker build -t paddle:prod -f build/Dockerfile ./build
 
    以上命令会按照生成的Dockerfile把生成的程序拷贝到生产镜像中并做相应的配置，最终生成名为paddle:prod的生产镜像。
 

doc/getstarted/build_and_install/docker_install_en.rst

@@ -210,7 +210,7 @@ compiling tools and dependencies.
 
    .. code-block:: bash
 
-      docker build -t paddle:prod -f build/Dockerfile .
+      docker build -t paddle:prod -f build/Dockerfile ./build
 
    The above command will generate the production image by copying the compiled PaddlePaddle program into the image.
 

paddle/scripts/docker/README.md

@@ -119,7 +119,7 @@ Users can specify the following Docker build arguments with either "ON" or "OFF"
 The following command builds the production image:
 
 ```bash
-docker build -t paddle -f build/Dockerfile .
+docker build -t paddle -f build/Dockerfile ./build
 ```
 
 This production image is minimal -- it includes binary `paddle`, the shared library `libpaddle.so`, and Python runtime.

paddle/scripts/docker/build.sh

@@ -99,7 +99,7 @@ fi
 
 cat >> /paddle/build/Dockerfile <<EOF
 # Use different deb file when building different type of images
-ADD build/*.deb /
+ADD *.deb /
 # run paddle version to install python packages first
 RUN apt-get update &&\
     apt-get install -y python-pip && pip install -U pip && \