Make builders runnable by hand #4185

Job	Run time
build-macos	8m 8s
build-msys	11m 41s
build-distros (alpine)	14m 53s
build-multi-archs	14m 37s
build-distros (archlinux)	17m 1s
build-sanitizers	9m 36s
build-windows	28m 30s
build-distros (fedora)	11m 59s
build-sanitizers (-DMOLD_USE_ASAN=On)	12m 40s
build-distros (gentoo/stage3)	18m 14s
build-sanitizers (-DMOLD_USE_TSAN=On)	22m 46s
build-distros (opensuse/tumbleweed)	12m 23s
build-freebsd	17m 12s
build-distros (ubuntu:22.04)	10m 46s
	3h 30m 26s

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