build

restore: add --restore-descendants flag #68

Job	Run time
Build jj-lib without Git support	45s
Check protos	27s
cargo-deny (advisories)	24s
build (ubuntu-latest)	4m 40s
cargo-deny (bans licenses sources)	20s
build (macos-13)	11m 3s
Clippy check	2m 33s
Check that MkDocs can build the docs	20s
build (macos-14)	4m 19s
build (windows-latest)	11m 4s
Check that MkDocs can build the docs with Poetry 1.8	24s
Check formatting	15s
build (ubuntu-latest, --all-features)	5m 40s
	42m 14s

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