Add Config docs #781

Job	Run time
flatpak-amd64	2m 26s
freebsd-amd64	13m 58s
linux_x11wl (12, amd64, x86_64-linux-gnu, 0)	1m 9s
macos-arm64-amd64	1m 49s
linux_x11wl (12, arm64, aarch64-linux-gnu, 1)	38s
linux_x11wl (12, riscv64, riscv64-linux-gnu, 1)	51s
netbsd-amd64	11m 59s
linux_x11wl (12, armhf, arm-linux-gnueabihf, 1)	37s
linux_x11wl (12, ppc64el, powerpc64le-linux-gnu, 1)	37s
openbsd-amd64	13m 44s
openbsd-arm64	19m 42s
snap-amd64	3m 49s
windows-amd64	8m 57s
windows-arm64	7m 8s
	1h 27m 24s

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