treewide: Add nice GPL-3.0-or-later license header

This change also ensures that this repo is reuse-3.0 compliant.

1 files changed, 11 insertions, 0 deletions

diff --git a/update.sh b/update.sh
index 504710c2..ff10f870 100755
--- a/update.sh
+++ b/update.sh
@@ -1,4 +1,15 @@
 #!/usr/bin/env sh
+
+# nixos-config - My current NixOS configuration
+#
+# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# This file is part of my nixos-config.
+#
+# You should have received a copy of the License along with this program.
+# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
+
 __update_sh_run() {
     __update_sh_command="$1"
     shift 1