FROM ruby:3.2-slim-bookworm ARG PASSWORD RUN echo root:${PASSWORD} | chpasswd COPY apt-insecure.conf /etc/apt/apt.conf.d/99gemastik-insecure RUN apt-get -o Acquire::AllowInsecureRepositories=true 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