add github action to test on windows
add github action to test on windows

aumayr/beancount-web,beancount/fava,beancount/fava,yagebu/fava,beancount/fava,aumayr/beancount-web,beancount/fava,yagebu/fava,yagebu/fava,yagebu/fava,beancount/fava,aumayr/beancount-web,aumayr/beancount-web,yagebu/fava