init: 初始化cpp基础镜像配置

Dockerfile

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+FROM ubuntu:16.04
+COPY sources.list /etc/apt/sources.list
+RUN apt update && apt install software-properties-common -y
+RUN add-apt-repository ppa:ubuntu-toolchain-r/test
+RUN apt update && apt install gcc-6 g++-6 cmake libgtest-dev build-essential -y
+WORKDIR /usr/src/gtest/
+RUN cmake CMakeLists.txt
+RUN make && cp *.a /usr/lib/

sources.list

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+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
+# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse