build

diff: reuse precomputed hash values #110

Job	Run time
Build jj-lib without Git support	48s
cargo-deny (advisories)	23s
build (ubuntu-latest)	5m 14s
cargo-deny (bans licenses sources)	25s
build (macos-13)	6m 37s
build (macos-14)	3m 59s
build (windows-latest)	11m 15s
Check protos	22s
Clippy check	2m 43s
Check that MkDocs can build the docs	23s
build (ubuntu-latest, --all-features)	6m 1s
Check that MkDocs can build the docs with Poetry 1.8	22s
Check formatting	17s
	38m 49s

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