Add openssh-server install to be able to connect to the container
Add soapui box definition (need to find a way to automate the shell
script to install soap)
Make the soapui install reproductible

To run the soapui, use something like:

```sh
	xhost + && \
	  docker run -it \
	  -v /tmp/.X11-unix:/tmp/.X11-unix \
	  -e DISPLAY=unix$(DISPLAY) \
	  ardumont/ubuntu-soapui:run
```