Add a license header and some description

utils/publish/update-docker-hub-full-description.sh

@@ -1,8 +1,27 @@
 #!/bin/bash
 
+# Docker Seafile client, help you mount a Seafile library as a volume.
+# Copyright (C) 2019, flow.gunso@gmail.com
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 # Based upon https://gist.github.com/jlhawn/8f218e7c0b14c941c41f
 # and https://github.com/moikot/golang-dep/blob/master/.travis/push.sh
 
+# This action can only be done with the actual owner of the repository,
+# unless you can extend the collaborator's permissions but as far as I know, you can't.
+
 # Install required system packages.
 apk add curl jq