Git negotiation test fails when `git daemon` is missing

[Leonidas-from-XIV]

Expected Behavior

The tests are all passing.

Actual Behavior

File "test/expect-tests/dune_pkg/rev_store_fetch_depth/rev_store_fetch_depth_test.ml", line 1, characters 0-0:
diff --git a/_build/default/test/expect-tests/dune_pkg/rev_store_fetch_depth/rev_store_fetch_depth_test.ml b/_build/.sandbox/4d0809bf1261a43eaac8c00d9cf28850/default/test/expect-tests/dune_pkg/rev_store_fetch_depth/rev_store_fetch_depth_test.ml.corrected
index 5134d04bda..5ca5722962 100644
--- a/_build/default/test/expect-tests/dune_pkg/rev_store_fetch_depth/rev_store_fetch_depth_test.ml
+++ b/_build/.sandbox/4d0809bf1261a43eaac8c00d9cf28850/default/test/expect-tests/dune_pkg/rev_store_fetch_depth/rev_store_fetch_depth_test.ml.corrected
@@ -195,5 +195,5 @@ let%expect_test "second fetch uses refs for efficient negotiation (fix #13323)"
   (* With refs created by previous fetches, git can tell the server what it
      already has, avoiding redundant downloads. The count does not include
      refs from the unrelated remote due to URL-based namespacing. *)
-  [%expect {| Negotiation 'have' lines sent: 3 |}]
+  [%expect {| |}]
 ;;

I've narrowed it down and the issue seems to be that the code is launching git-daemon but despite being part of Git according to the linked page, my OS does not seem to ship it:

$ git daemon
git: 'daemon' is not a git command. See 'git --help'.

Reproduction

1. Don't have git daemon installed
2. dune runtest

Specifications

• Version of dune (output of dune --version): main
• Version of ocaml (output of ocamlc --version): 5.4.1
• Operating system (distribution and version): Fedora 43

Additional information

• Link to gist with verbose output (run dune with the --verbose flag):

[rgrinberg]

A good start might be to make this test depend on this binary explicitly.