Returns the name and tag of image that has the basic build dependencies installed with just pyenv installed,
        with no python installed. (Builds or pulls the image if it doesn't exist locally.)

def get_arca_base(self, pull=True):
        """
        Returns the name and tag of image that has the basic build dependencies installed with just pyenv installed,
        with no python installed. (Builds or pulls the image if it doesn't exist locally.)
        """
        name = self.get_arca_base_name()
        tag = arca.__version__

        pyenv_installer = "https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer"
        dockerfile = f"""
            FROM debian:stretch-slim
            RUN apt-get update && \
                apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \
                                   libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
                                   xz-utils tk-dev libffi-dev git locales && \
                apt-get clean

            RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && locale-gen
            ENV LANG en_US.UTF-8
            ENV LANGUAGE en_US:en
            ENV LC_ALL en_US.UTF-8

            RUN adduser --system --disabled-password --shell /bin/bash arca

            USER arca
            WORKDIR /home/arca
            RUN echo "source $HOME/.bash_profile" >> .bashrc

            RUN curl -L {pyenv_installer} -o ~/pyenv-installer && \
                  /bin/bash ~/pyenv-installer && \
                  rm ~/pyenv-installer && \
                  echo 'export PYENV_ROOT="$HOME/.pyenv"' >> /home/arca/.bash_profile && \
                  echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> /home/arca/.bash_profile && \
                  echo 'eval "$(pyenv init -)"' >> /home/arca/.bash_profile

            USER root

            RUN apt-get remove -y --autoremove curl && \
                apt-get clean -y

            RUN mkdir /srv/scripts

            USER arca

            SHELL ["bash", "-lc"]
            CMD bash -i
        """

        self.get_or_build_image(name, tag, dockerfile, pull=pull)
        return name, tag