FROM ubuntu:22.04
RUN apt update && apt install -y openssh-server
RUN echo 'root:root' | chpasswd
RUN sed -i 's/#\?PermitRootLogin .*/PermitRootLogin yes/' /etc/ssh/sshd_config && \
    sed -i 's/#\?PasswordAuthentication .*/PasswordAuthentication yes/' /etc/ssh/sshd_config

RUN mkdir /var/run/sshd
EXPOSE 22
CMD ["/usr/sbin/sshd", "-D"]