build

Add commit backend for tests, fix bug in `MergedTree` #6933

Job	Run time
build (ubuntu-latest)	10m 54s
cargo-deny (advisories)	30s
build (macos-13)	6m 14s
cargo-deny (bans licenses sources)	33s
build (windows-latest)	12m 39s
build (ubuntu-latest, --all-features)	8m 25s
Check protos	53s
Clippy check	3m 34s
Check that MkDocs can build the docs	26s
Check formatting	18s
	44m 26s

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