feat(test_build_system): add buildv2 test for linux target build

Add a simple test to verify that the buildv2_test_app can be built for
the Linux target.

Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>

tools/test_build_system/buildv2/test_linux_build.py

@@ -0,0 +1,14 @@
+# SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Apache-2.0
+import logging
+import sys
+
+import pytest
+from test_build_system_helpers import IdfPyFunc
+
+
+@pytest.mark.skipif(sys.platform == 'win32', reason='Unix test')
+@pytest.mark.usefixtures('test_app_copy')
+def test_linux_target_build(idf_py: IdfPyFunc) -> None:
+    logging.info('Can build for Linux target')
+    idf_py('--preview', '-DIDF_TARGET=linux', 'build')