Reimplement mingw cross-compile docker image #6568
Merged
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rwgrim/msys2-cross on dockerhub we're currently using is incapable of being updated anymore because of changes in msys2 keyring and rebuilding the image from scratch is hard because it requires manual setup and many things seems to have broken due to changes in pacman and the like. So I made my own variant of it that downloads msys2 as archive, and uses pacman from archlinux base image to download msys2 package updates. rwgrim/msys2-cross uses debian base with pacman-static but I couldn't make this way work since new version of pacman-static seems to depend on some extra config files not existing in debian.