Return [result] from [Workspace_root.create] #28270

Job	Run time
Coverage (5.1.x)	9m 43s
Nix (macos-latest)	1m 51s
Nix (ubuntu-latest)	54s
Build microbenchmarks	1m 42s
Coq 8.16.1	7m 32s
Create local opam switch (macos-latest, 5)	5m 45s
Build (macos-latest, 5.1.x)	14m 31s
Create local opam switch (macos-latest, 4.14)	5m 43s
Documentation	1m 13s
Build (ubuntu-latest, 5.1.x)	9m 2s
Format	1m 4s
Create local opam switch (ubuntu-latest, 5)	5m 8s
Build (ocaml-variants.5.3.0+trunk, ubuntu-latest, true)	4m 57s
Create local opam switch (ubuntu-latest, 4.14)	4m 57s
Build monorepo benchmark docker image	3m 51s
Build (4.14.x, ubuntu-latest, true)	1m 29s
Build (4.14.x, macos-latest, true)	2m 19s
Build (5.1.x, macos-13, true)	4m 0s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	16m 8s
Build (ocaml-base-compiler.5.1.1,system-mingw, windows-latest)	10m 29s
Build (4.08.x, ubuntu-latest, true)	2m 1s
Build (4.04.x, ubuntu-latest, true, true)	4m 45s
Build (4.02.x, ubuntu-latest, true)	4m 13s
	2h 3m 17s

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