[5.2] Build occurrences index for Merlin #27092

Job	Run time
Build (macos-latest, 4.14.x)	20m 35s
Build (ubuntu-latest, 4.14.x)	12m 17s
Build (windows-latest, 4.14.x)	6m 23s
Coverage (4.14.x)	11m 55s
Build (ocaml-variants.5.3.0+trunk, ubuntu-latest, true)	2m 21s
Coq 8.16.1	8m 47s
Create local opam switch (macos-latest, 5)	5m 49s
Build (5.1.x, ubuntu-latest, true)	2m 20s
Create local opam switch (macos-latest, 4.14)	5m 57s
Build (5.1.x, macos-latest, true)	2m 54s
MSVC 4.14.0 / windows_x86	10m 14s
Create local opam switch (ubuntu-latest, 5)	5m 21s
Build (4.14.x, macos-13, true)	5m 18s
MSVC 4.14.0 / windows_x86_64	10m 33s
Build (4.13.x, ubuntu-latest, true)	2m 25s
Documentation	36s
Build (4.08.x, ubuntu-latest, true)	2m 32s
Create local opam switch (ubuntu-latest, 4.14)	5m 18s
Build (4.04.x, ubuntu-latest, true, true)	5m 18s
Format	2m 24s
Build monorepo benchmark docker image	3m 46s
Build (4.02.x, ubuntu-latest, true)	4m 47s
Nix (macos-latest)	1m 57s
Nix (ubuntu-latest)	56s
	2h 20m 43s

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