build

github(nix): don't build `jj` twice when testing #9392

Job	Run time
build (ubuntu-latest)	3m 9s
cargo-deny (advisories)	22s
Check protos	22s
build (macos-14)	3m 10s
cargo-deny (bans licenses sources)	24s
build (windows-latest)	15m 1s
build (ubuntu-latest, --all-features)	4m 15s
Clippy check	2m 21s
Check that MkDocs can build the docs	22s
Check that MkDocs can build the docs with Poetry 1.3.2	33s
Check formatting	17s
	30m 16s

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