This is a simple docker image that can be used to cross
compile Qt applications for the Windows plattform. It
does not much more than building the environment using
the project at https://github.com/mxe/mxe.git, copying
the sources of the directory and then invoking
qmake and make.
To start the compiling process, simply enter
$ ./build
from the command line. You can test the application on Linux using Wine
$ wine ./helloworld.exe