直接dockerfile里添加安装tzdata

FROM alpine:3.7

MAINTAINER Rethink 
#更新Alpine的软件源为国内（清华大学）的站点，因为从默认官源拉取实在太慢了。。。
# RUN echo "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main/" > /etc/apk/repositories

RUN apk update \
        && apk upgrade \
        && apk add --no-cache bash \
        bash-doc \
        bash-completion \
        # timezone
        tzdata \
        && rm -rf /var/cache/apk/* \
        && /bin/bash

RUN apk update \
        && apk upgrade \
        && apk add -U 
RUN cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime