CI improvements 20250918 #78

Job	Run time
build (windows-latest, x86_64, msys2, )	6m 10s
build (macos-latest, arm64, bash, , port)	15m 17s
build (ubuntu-latest, x86_64, bash, ubuntu:20.04, --user 0)	1m 26s
build (ubuntu-24.04-arm, arm64, bash, ubuntu:20.04, --user 0)	1m 45s
build (macos-latest, arm64, bash, , brew)	2m 25s
build (macos-13, x86_64, bash, , brew)	4m 21s
	31m 24s

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