pkg: add repro for gh10991 #28611

Job	Run time
Format	1m 0s
Nix (macos-latest)	1m 55s
Build microbenchmarks	2m 17s
Build (macos-latest, 5.1.x)	13m 57s
Nix (ubuntu-latest)	52s
Coq 8.16.1	7m 11s
Build (ubuntu-latest, 5.1.x)	8m 40s
Coverage (5.1.x)	9m 22s
Build (ocaml-variants.5.3.0+trunk, ubuntu-latest, true)	4m 55s
Create local opam switch (macos-latest, 5)	6m 9s
Documentation	47s
Build (4.14.x, ubuntu-latest, true)	1m 41s
Create local opam switch (macos-latest, 4.14)	6m 1s
Build monorepo benchmark docker image	1m 44s
Build (4.14.x, macos-latest, true)	2m 57s
Create local opam switch (ubuntu-latest, 5)	5m 16s
Build (5.1.x, macos-13, true)	7m 14s
Create local opam switch (ubuntu-latest, 4.14)	7m 15s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	15m 53s
Build (ocaml-base-compiler.5.1.1,system-mingw, windows-latest)	10m 12s
Build (4.08.x, ubuntu-latest, true)	1m 35s
Build (4.04.x, ubuntu-latest, true, true)	4m 47s
Build (4.02.x, ubuntu-latest, true)	3m 59s
	2h 5m 39s

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