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We recently switched to a 1809 windows runner over the 1607 and rebuilt the containers. Looks like the behavior of the msys2 job regressed heavily with it. I'd say a first good step would be to update the msys binary we are using and see what issues still persist.

Main issues:

• Msys2 job doesn't utilize all the cores of the runner, dragging over the time needed to complete the build
• Meson configure phase takes multiple minutes now, ~10min is the usual time
• Msys packages install had to be moved out of the docker image cause for some reason docker build would hang endlessly then

Bonus points:

• Try installing msys (and rest of things) with choco in the docker image