feat: set org.nethserver.volumes label (#168)

Suggest volume `nextcloud-app-data` to be located on an additional disk.

Refs NethServer/dev#7728 NethServer/dev#7665

Author: DavidePrincipi

build-images.sh

@@ -30,6 +30,7 @@ buildah config --entrypoint=/ \
     --label="org.nethserver.authorizations=traefik@any:routeadm cluster:accountconsumer" \
     --label="org.nethserver.tcp-ports-demand=1" \
     --label="org.nethserver.rootfull=0" \
+    --label="org.nethserver.volumes=nextcloud-app-data" \
     --label="org.nethserver.min-from=1.4.3" \
     --label="org.nethserver.min-core=3.12.4-0" \
     --label="org.nethserver.images=docker.io/redis:7.4.5-alpine docker.io/mariadb:10.6.24 docker.io/nginx:1.29.2-alpine ghcr.io/nethserver/nextcloud-app:${IMAGETAG} ghcr.io/nethserver/nextcloud-notify_push:${IMAGETAG}" \