build

repo: load index eagerly to simplify error handling #12734

Job	Run time
build (ubuntu-latest)	4m 31s
build (macos-14)	3m 13s
Build jj-lib without Git support	43s
build (windows-latest)	9m 55s
build (ubuntu-latest, --all-features)	5m 28s
cargo-deny (advisories)	27s
cargo-deny (bans licenses sources)	26s
Check protos	25s
Clippy check	2m 24s
Check that MkDocs can build the docs	24s
Check that MkDocs can build the docs with Poetry 1.8	23s
Check formatting	17s
	28m 36s

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