[config] Add fake script to mock integration

This will allow for proper testing of the changes to the
milestone_roller.

Bug: 123410
Change-Id: I6c25b5572e570d4b33bb95d1e78ffceba882e51f
Reviewed-on: https://fuchsia-review.googlesource.com/c/infra/roller-tests/integration/+/817271
Reviewed-by: Anthony Fandrianto <atyfto@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Fuchsia-Auto-Submit: Catherine Duncan <catduncan@google.com>
diff --git a/infra/config/scripts/setup_branch_cq.sh b/infra/config/scripts/setup_branch_cq.sh
new file mode 100755
index 0000000..0161c85
--- /dev/null
+++ b/infra/config/scripts/setup_branch_cq.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+# Copyright 2023 The Fuchsia Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file is intentionally empty but still executable so that it can be
+# invoked by recipe tests.