Add a sdist release step #176

Job	Run time
linux (x86_64)	1m 41s
linux-cross (aarch64)	2m 20s
macos	1m 44s
linux (i686)	2m 36s
linux-cross (armv7)	2m 46s
linux-cross (s390x)	2m 26s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	1m 30s
linux-cross (ppc64le)	2m 40s
musllinux (x86_64-unknown-linux-musl)	1m 0s
sdist	8s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	1m 51s
linux-cross (ppc64)	2m 21s
musllinux (i686-unknown-linux-musl)	58s
windows (x64)	1m 55s
windows (x86)	2m 5s
Release	0s
	28m 1s

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