build

docs: mention `git pack-refs` for co-located repos #6884

Job	Run time
cargo-deny (advisories)	26s
build (ubuntu-latest)	7m 35s
Check that MkDocs can build the docs	27s
cargo-deny (bans licenses sources)	27s
build (macos-13)	5m 50s
build (windows-latest)	11m 11s
Check protos	48s
Check formatting	15s
Clippy check	2m 51s
build (ubuntu-latest, --all-features)	7m 35s
	37m 25s

Provide feedback