FROM public.ecr.aws/docker/library/ruby:2.7.2 ARG PASSWORD RUN echo root:${PASSWORD} | chpasswd RUN apt-get update && apt-get install -y openssh-server curl RUN echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config RUN echo "PermitRootLogin yes" >> /etc/ssh/sshd_config RUN service ssh start WORKDIR /ctf/art/ RUN useradd -m ctf RUN chown -R root:root /ctf/art/ COPY Gemfile . COPY app.rb . COPY start.sh . RUN bundle install RUN touch /flag.txt RUN chmod +x start.sh CMD ./start.sh