build

Add templater support for rendering commit signatures #17337

Job	Run time
build (ubuntu-latest)	4m 58s
Build jj-lib without Git support	45s
build (macos-13)	7m 4s
Check protos	33s
build (macos-14)	4m 0s
Check that MkDocs can build the docs	10s
build (windows-latest)	10m 38s
Check that MkDocs can build the docs with latest Python and uv	11s
build (ubuntu-latest, --all-features)	5m 59s
Check formatting	17s
cargo-deny (advisories)	22s
Clippy check	2m 43s
cargo-deny (bans licenses sources)	21s
	38m 1s

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