Run Apple specific tests on CI (#9236)

Author: shoumikhin

.ci/scripts/unittest-macos-buck2.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+set -eux
+
+buck2 test //extension/apple:ExecuTorch

.ci/scripts/unittest-macos.sh

@@ -35,6 +35,7 @@ if [[ "$BUILD_TOOL" == "cmake" ]]; then
     .ci/scripts/unittest-macos-cmake.sh
 elif [[ "$BUILD_TOOL" == "buck2" ]]; then
     .ci/scripts/unittest-buck2.sh
+    .ci/scripts/unittest-macos-buck2.sh
 else
     echo "Unknown build tool $BUILD_TOOL"
     exit 1