Added sample Dockerfile for dev environment

docker/dev/Dockerfile

@@ -0,0 +1,11 @@
+FROM ubuntu
+RUN apt update
+RUN apt install -y openssh-server
+RUN mkdir /var/run/sshd
+RUN echo 'root:password' | chpasswd
+RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
+RUN sed -i 's/#PasswordAuthentication yes/PasswordAuthentication yes/' /etc/ssh/sshd_config
+ADD authorized_keys /root/.ssh/authorized_keys
+RUN chmod 600 /root/.ssh/authorized_keys
+EXPOSE 22
+CMD ["/usr/sbin/sshd", "-D"]

docker/dev/authorized_keys

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+ssh-rsa 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 2021-1

docker/dev/build.sh

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+#!/bin/bash
+docker build -t dev .