Dockerfile

FROM ubuntu:22.04

ENV DEBIAN_FRONTEND=noninteractive

RUN apt update && apt install -y openssh-server

RUN mkdir /var/run/sshd
RUN echo 'root:root' | chpasswd

RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config

COPY start.sh /start.sh
RUN chmod +x /start.sh

CMD ["bash","/start.sh"]