build

Add templater support for rendering commit signatures #16575

Job	Run time
Build jj-lib without Git support	47s
build (ubuntu-latest)	5m 0s
build (macos-13)	5m 53s
Clippy check	2m 19s
Check protos	38s
build (macos-14)	3m 54s
cargo-deny (advisories)	24s
build (windows-latest)	10m 25s
cargo-deny (bans licenses sources)	25s
Check that MkDocs can build the docs	12s
Check that MkDocs can build the docs with latest Python and uv	13s
build (ubuntu-latest, --all-features)	6m 2s
Check formatting	16s
	36m 28s

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