Add dune tools env to configure PATH #29825

Job	Run time
Coq 8.16.1	7m 7s
Build microbenchmarks	2m 34s
Create local opam switch (macos-latest, 5)	7m 48s
Build (macos-latest, 5.1.x)	13m 54s
Create local opam switch (macos-latest, 4.14)	7m 23s
Documentation	57s
Build (ubuntu-latest, 5.1.x)	9m 25s
Create local opam switch (ubuntu-latest, 5)	5m 4s
Format	1m 3s
Build (ocaml-variants.5.4.0+trunk, ubuntu-latest, true)	1m 36s
Create local opam switch (ubuntu-latest, 4.14)	5m 42s
Build (4.14.x, ubuntu-latest, true)	1m 41s
Build monorepo benchmark docker image	3m 50s
Nix (macos-latest)	2m 5s
Wasm_of_ocaml	10m 56s
Nix (ubuntu-latest)	53s
Build (4.14.x, macos-latest, true)	2m 29s
Build (5.1.x, macos-13, true)	4m 51s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	14m 35s
Build (ocaml-base-compiler.5.1.1,system-mingw, windows-latest)	8m 14s
Build (4.08.x, ubuntu-latest, true)	2m 35s
Build (4.04.x, ubuntu-latest, true, true)	4m 42s
Build (4.02.x, ubuntu-latest, true)	4m 51s
	2h 4m 15s

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