Dockerfile

FROM debian:latest
ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get update && apt-get install -y passwd expect sudo
#RUN useradd -m -u 1000 -s /bin/bash admin
#RUN echo 'admin:pass' | chpasswd
RUN useradd -m -d /home/nonrootuser nonrootuser && echo 'nonrootuser:password' | chpasswd
RUN apt-get clean && rm -rf /var/lib/apt/lists/*
RUN echo "admin ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
COPY su.sh /home/admin/su.sh
RUN chown -R 1000 /home && chmod -R 700 /home && chmod +x /home/admin/su.sh
RUN  chmod u+s /usr/bin/whoami
USER admin
WORKDIR /home/admin
CMD whoami && pwd && ls && (/home/admin/su.sh nonrootuser password whoami)