Merge pull request #69367 from dogboydog/3.x_csharp_build_exit_code

3.x Exit editor with non-zero return code if --build-solutions fails

main/main.cpp

@@ -2437,9 +2437,11 @@ bool Main::iteration() {
 		auto_build_solutions = false;
 		// Only relevant when running the editor.
 		if (!editor) {
+			OS::get_singleton()->set_exit_code(EXIT_FAILURE);
 			ERR_FAIL_V_MSG(true, "Command line option --build-solutions was passed, but no project is being edited. Aborting.");
 		}
 		if (!EditorNode::get_singleton()->call_build()) {
+			OS::get_singleton()->set_exit_code(EXIT_FAILURE);
 			ERR_FAIL_V_MSG(true, "Command line option --build-solutions was passed, but the build callback failed. Aborting.");
 		}
 	}