Terminal PS1 in KubruntuDev.Dockerfile

[taiya]

This didn't work, and many attempts available by searching (e.g. link)

RUN echo 'export PS1="(\h) \[\e[33m\]\w: \[\e[0m\]"' >> /root/.bashrc
RUN echo 'export LSCOLORS=ExFxCxDxBxegedabagacad' >> /root/.bashrc
RUN echo 'export ENV CLICOLOR=1' >> /root/.bashrc