- added license

validate_workflow.sh

 #!/usr/bin/env bash
-
+# Author: Andreas Romeyke
+# SLUB Dresden, Department Longterm Preservation
+# copyright 2023, licensed under terms of GNU General Public License 3.0,
+# see file LICENSE.txt for details.
 ### META
 # AUTHORS:
 #  - Andreas Romeyke (<Andreas.Romeyke@slub-dresden.de>)