bug: Project folder name upper case not converted(?) to lower when compiling

[apawlik]

When compiling a project folder with name starting with uppercase, dockter gives an error:

server error - invalid reference format: repository name must be lowercase 

This is probably related to: https://stackoverflow.com/questions/48522615/docker-error-invalid-reference-format-repository-name-must-be-lowercase

Changing the name of the project folder fixed it but we should reflect that in the documentation or deal with the naming.