build

Add multi-tool config for `jj fix` #12527

Job	Run time
Build jj-lib without Git support	49s
build (ubuntu-latest)	4m 14s
build (macos-14)	3m 18s
cargo-deny (advisories)	21s
Check protos	34s
build (windows-latest)	9m 18s
cargo-deny (bans licenses sources)	23s
build (ubuntu-latest, --all-features)	5m 10s
Clippy check	2m 32s
Check that MkDocs can build the docs	22s
Check that MkDocs can build the docs with Poetry 1.8	32s
Check formatting	15s
	27m 48s

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