dockerfile 精简求助

FROM tomcat:8.0
MAINTAINER sunwei
ENV REFRESHED_AT 2018-08-23

WORKDIR /root

RUN wget https://jaist.dl.sourceforge.net/project/openofficeorg.mirror/4.1.5/binaries/zh-CN/Apache_OpenOffice_4.1.5_Linux_x86-64_install-deb_zh-CN.tar.gz && tar -zxvf ./*.tar.gz
RUN rm -rf /root/*.tar.gz 
RUN cd zh-CN/DEBS && dpkg -i *.deb 
RUN cd zh-CN/DEBS/desktop-integration && dpkg -i *.deb 
ADD startup.sh /root
ADD Fonts/* /opt/openoffice4/share/fonts/truetype/
RUN pwd && ls && chmod u+x startup.sh
#公开端口
EXPOSE 8080 443
#设置启动命令
ENTRYPOINT ["./startup.sh"] 

怎么精简到最小