Run unit tests on Windows

[pstelzig]

Problem description

• As of v0.2.2, the unit tests as well as the pipeline examples in .github/workflows are for on Ubuntu Linux only
• The openmodelica/openmodelica:v1.21.0-minimal is also based on Ubuntu

Desired behavior

• Create a test pipeline that runs the unit tests Windows, too

[pstelzig]

Try out the setup-openmodelica GitHub Action by Andreas Heuermann for setting up OpenModelica in Windows runner.