Add GitHub workflows for Windows #36

Job	Run time
matrix-windows / Build against Qt 5.15.* on Windows	5m 42s
matrix-windows / Build against Qt 6.6.* on Windows	5m 28s
matrix-linux / Build against Qt 5 on debian:stable	1m 8s
matrix-linux / Build against Qt 6 on debian:stable	1m 20s
matrix-linux / Build against Qt 5 on debian:testing	1m 24s
matrix-linux / Build against Qt 6 on debian:testing	1m 7s
matrix-linux / Build against Qt 5 on fedora:38	2m 18s
matrix-linux / Build against Qt 6 on fedora:38	1m 51s
matrix-linux / Build against Qt 5 on fedora:39	1m 23s
matrix-linux / Build against Qt 6 on fedora:39	1m 56s
matrix-linux / Build against Qt 5 on fedora:rawhide	2m 1s
matrix-linux / Build against Qt 6 on fedora:rawhide	1m 47s
matrix-linux / Build against Qt 5 on ubuntu:latest	1m 34s
matrix-linux / Build against Qt 6 on ubuntu:latest	1m 9s
matrix-linux / Build against Qt 5 on ubuntu:rolling	57s
matrix-linux / Build against Qt 6 on ubuntu:rolling	1m 25s
	32m 30s

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