git: colocate repos by default #5097

Job	Run time
check (doctests)	3m 10s
check (zizmor)	43s
check (protos)	1m 32s
check (rustfmt)	19s
check (codespell)	11s
check (mkdocs)	21s
check (latest mkdocs, optional)	17s
check (Cargo.lock dependency count)	3s
nix flake (ubuntu-24.04)	7m 33s
nix flake (ubuntu-24.04-arm)	5m 39s
build (no git)	1m 27s
check (clippy)	1m 31s
test (linux-aarch64-gnu)	4m 6s
test (macos-x86_64)	7m 22s
test (linux-x86_64-gnu)	5m 28s
test (windows-x86_64)	10m 54s
test (windows-aarch64)	9m 6s
check (cargo-deny, bans)	30s
check (cargo-deny, sources)	25s
test (macos-aarch64)	4m 6s
check (cargo-deny, licenses)	25s
check (cargo-deny, advisories)	24s
required checks (merge queue)	0s
	1h 5m 32s

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