Explore how squish can be run with docker

Starting point: https://www.froglogic.com/blog/squish-gui-testing-with-docker-containers/ 

And eventually, we need to:

1. use qt_v6.3.0_linux as the base docker image
2. install everything related to Squish to this docker image
3. compile a "simple qt application" which has UI (e.g. button)
4. open that application using squish
5. click on button of that application