Update int.cloudbuild.yaml

Author: apeabody

build/int.cloudbuild.yaml

@@ -30,6 +30,7 @@ steps:
       git fetch --unshallow
       git diff origin/${_BASE_BRANCH} --name-only > _changed_files
       sed 's:[^/]*$::' _changed_files > _changed_folders
+      sort -u _changed_folders
       echo Changed folders:
       cat _changed_folders