new: added a new ``pre_deploy`` hook for anything to do before launching docker-compose and after relations

bin/compose

@@ -2879,6 +2879,8 @@ if [ "$full_init" ]; then
         run_service_relations "${services[@]}" || exit 1
     fi
 
+    run_service_hook pre_deploy "${services[@]}" || exit 1
+
 fi