FROM node:26.2.0-trixie-slim
WORKDIR /app
RUN apt-get update && apt-get install -yq socat && rm -rf /var/lib/apt/lists/*
COPY jail.js .
USER nobody:nogroup
CMD ["socat", "-T60", "tcp-listen:1337,fork,reuseaddr", "exec:'node jail.js',stderr"]
