build

github(nix): don't build `jj` twice when testing #9393

Job	Run time
build (ubuntu-latest)	3m 6s
Check protos	25s
cargo-deny (advisories)	24s
cargo-deny (bans licenses sources)	26s
build (macos-14)	3m 26s
Check that MkDocs can build the docs	24s
build (windows-latest)	7m 51s
Check that MkDocs can build the docs with Poetry 1.3.2	34s
build (ubuntu-latest, --all-features)	4m 9s
Check formatting	15s
Clippy check	2m 16s
	23m 16s

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