Merge pull request #447 from zcash/keystone-prep #3307

Job	Run time
Book tests	15s
Bitrot check	2m 10s
Latest build on ubuntu-latest	55s
Build target wasm32-wasi	1m 23s
Latest build on windows-latest	2m 49s
Code coverage	9m 4s
Latest build on macOS-latest	1m 5s
Intra-doc links	2m 15s
Rustfmt	12s
Test on ubuntu-latest	10m 7s
Test on windows-latest	11m 20s
Test on macOS-latest	10m 1s
	51m 36s

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