[MLRun] Fix shebang with copyright (#2296)

automation/scripts/github_workflow_free_space.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env sh
 # Copyright 2018 Iguazio
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -12,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-#!/usr/bin/env sh
 
 print_free_space() {
   df --human-readable