Dockerfile to create a Ubuntu container with zsh and shellinabox

Dockerfile.devenv

# docker build --file Dockerfile-devenv.txt -t devenv .
# docker run -it --name devenv -p 4200:4200 -d devenv zsh
FROM ubuntu:latest
ARG USERNAME=user
ARG USER_UID=1000
ARG USER_GID=$USER_UID


RUN groupadd --gid $USER_GID $USERNAME \
    && useradd --uid $USER_UID --gid $USER_GID -m $USERNAME \
    #
    # [Optional] Add sudo support. Omit if you don't need to install software after connecting.
    && apt-get update \
    && apt-get install -y sudo \
    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
    && chmod 0440 /etc/sudoers.d/$USERNAME

WORKDIR /home/$USERNAME
USER $USERNAME


RUN sudo apt-get update
RUN sudo apt-get upgrade -y
RUN sudo apt-get install zsh git curl bash vim nano openssh-server shellinabox -y
RUN sudo chsh -s $(which zsh) $USERNAME
RUN sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)" "" --unattended
RUN git clone https://github.com/zsh-users/zsh-autosuggestions.git /home/$USERNAME/.oh-my-zsh/custom/plugins/zsh-autosuggestions
RUN git clone https://github.com/zsh-users/zsh-syntax-highlighting.git /home/$USERNAME/.oh-my-zsh/custom/plugins/zsh-syntax-highlighting

RUN curl https://raw.githubusercontent.com/canha/golang-tools-install-script/master/goinstall.sh | bash

RUN echo export ZSH=\"\$HOME/.oh-my-zsh\" > /home/$USERNAME/.zshrc
RUN echo ZSH_THEME=\"robbyrussell\" >> /home/$USERNAME/.zshrc
RUN echo plugins=\(git zsh-autosuggestions zsh-syntax-highlighting\) >> /home/$USERNAME/.zshrc
RUN echo source \$ZSH/oh-my-zsh.sh >> /home/$USERNAME/.zshrc
#RUN echo service shellinabox start >> /home/$USERNAME/.zshrc

USER root
#RUN echo -e "new_password\nnew_password" | (passwd $USERNAME)
RUN echo "$USERNAME:password" | chpasswd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/g' /etc/ssh/sshd_config
RUN sed -i 's/SHELLINABOX_ARGS="--no-beep"/SHELLINABOX_ARGS="--no-beep --disable-ssl"/g' /etc/default/shellinabox


USER $USERNAME
EXPOSE 4200
# CMD ["/usr/bin/shellinaboxd", "--port", "4200", "--no-beep", "--disable-ssl"]
CMD ["zsh"]