Add a deployment dockerfile
Add a deployment dockerfile

Because the current vagrant setup with docker builds a container
depending with sshd, supervisor, and postgresql without adding the
code (because vagrant automatically adds the volume)

agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,lukasjuhrich/pycroft