tests: posix: cat(1p): added POSIX-compliant cat

tests/posix/bin/false

@@ -0,0 +1,12 @@
+#!/bin/sh
+# Copyright (c) 2024 DTB <trinity@trinity.moe>
+# Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
+# SPDX-License-Identifier: FSFAP
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice and this
+# notice are preserved.  This file is offered as-is, without any warranty.
+
+# Strictly POSIX-compliant false(1) implementation. See false(1p)
+
+false "$@"