Extra tools for docker

[janpfeifer]

• Added extra tools to Dockerfile to allow users to install other dependencies; added sudo for apt install and apt update. Use case and question about adding OpenSSH to the docker image. #138

[janpfeifer]

• Feature request Use case and question about adding OpenSSH to the docker image. #138
  • Added openssh-client, rsync and curl, to allow users to install other dependencies.
  • Added sudo for apt install and apt update.
  • Added support for autostart.sh that if present in the mounted container /notebooks directory, and if root owned
    and set as executable.
• Updated Dockerfile to latest version to JupyterLab -- now the base docker is served quay.io/jupyter/base-notebook