FROM ubuntu

RUN mkdir /src
WORKDIR /src
COPY call_me_maybe.c .

RUN apt-get update && \
    apt-get install -y build-essential

RUN gcc -fno-stack-protector  -o call_me_maybe call_me_maybe.c
RUN cp /src/call_me_maybe /
RUN rm -r /src
RUN chmod +x /call_me_maybe
RUN useradd ctf

USER ctf
CMD ["/call_me_maybe"]