Use builder pattern #29

Job	Run time
cross-check (aarch64-linux-android)	35s
cross-check-unsupported-platform (x86_64-unknown-illumos)	35s
x86_64-unknown-linux-gnu	26s
cross-check (armv7-linux-androideabi)	13s
check (ubuntu-latest)	17s
x86_64-apple-darwin	28s
cross-check (aarch64-apple-darwin)	17s
check (macos-latest)	20s
minimal-versions (ubuntu-latest)	19s
x86_64-pc-windows-msvc	2m 47s
check (windows-latest)	1m 3s
minimal-versions (macos-latest)	25s
x86_64-unknown-linux-musl	34s
minimal-versions (windows-latest)	1m 5s
armv7-unknown-linux-musleabihf	39s
armv7-unknown-linux-gnueabihf	50s
aarch64-unknown-linux-musl	38s
aarch64-unknown-linux-gnu	35s
	12m 6s

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