Dockerfile

FROM debian:latest
ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get update && apt-get install -y passwd
RUN useradd -m -u 1000 -s /bin/bash admin
RUN echo 'admin:pass' | chpasswd
RUN useradd -u 1001 1001 && echo '1001:pass' | chpasswd
RUN apt-get clean && rm -rf /var/lib/apt/lists/*
RUN echo 'admin ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers
COPY <<EOF /home/admin/su.sh
#!/usr/bin/expect

set user [lindex $argv 0]
set password [lindex $argv 1]
set command [lindex $argv 2]

spawn su - $user -c "$command"
expect "Password:"
send "$password\r"
interact
EOF
RUN chown -R 1000 /home && chmod -R 700 /home

USER admin
WORKDIR /home/admin
CMD whoami && pwd && ls && (echo pass | /home/admin/su.sh 1001 pass "whoami && pwd")