Gets variable username from <env>.tfvars
Created by: mxmxchere
Signed-off-by: Malte Münch muench@b1-systems.de
Currently if $USERNAME is set in the environment that calls make, this value is used instead of the value supplied in environments/environment-.tfvars. I am unsure whether this is intended or unintended. However with this version the value in the *.tfvars is used to connect in the various make targets