Preserve /cfg/network when upgrading FW

Fixes: 64a012b (velia: update and always copy the network file)
Change-Id: Icf5a09a13805efc25ed7ad49b6508e85a4ecb8a1
Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/velia/+/4075
Depends-on: https://cesnet-gerrit-public/c/CzechLight/velia/+/4075
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/velia/+/4075
diff --git a/package/czechlight-rauc/rauc-hook.sh b/package/czechlight-rauc/rauc-hook.sh
index 2899d4f..33d420a 100755
--- a/package/czechlight-rauc/rauc-hook.sh
+++ b/package/czechlight-rauc/rauc-hook.sh
@@ -9,6 +9,7 @@
             calibration \
             etc \
             journald-remote \
+            network \
             random-seed \
             sysrepo \
             ssh-user-auth \