cherry-pick improvements from #1635#1

reneleonhardt wants to merge 2 commits into

garasubo:more-arm64-docker-builds-2garasubo/cross:more-arm64-docker-builds-2from

reneleonhardt:more-arm64-docker-builds-2-and-1635reneleonhardt/slint-cross:more-arm64-docker-builds-2-and-1635Copy head branch name to clipboard