ci: archive tftf doc output

Change-Id: I5e48eb225ef7960cd9181510cf1e7c73197058bf
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/group/tftf-l1-check-docs/nil,build-docs:nil b/group/tftf-l1-check-docs/nil,build-docs:nil
index ece8967..dc4630c 100644
--- a/group/tftf-l1-check-docs/nil,build-docs:nil
+++ b/group/tftf-l1-check-docs/nil,build-docs:nil
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2020, Arm Limited. All rights reserved.
+# Copyright (c) 2020-2025, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -8,3 +8,7 @@
 pre_tftf_build() {
 	targets="doc" set_tftf_build_targets
 }
+
+post_package() {
+	mv "$tftf_root/docs/build" "$archive"
+}