Update int.cloudbuild.yaml

Author: apeabody

build/int.cloudbuild.yaml

@@ -31,7 +31,7 @@ steps:
       git diff origin/${_BASE_BRANCH} --name-only > _changed_files
       sed 's:[^/]*$::' _changed_files > _changed_folders
       sort -u -o _changed_folders{,}
-      echo Changed folders:
+      echo Folders with changes:
       cat _changed_folders
 
       # Do not prune if changing tests themselves
@@ -49,9 +49,11 @@ steps:
           fi
       done
 
+      find . -empty -type d -delete
+
       # Report remaining folders
       echo Folders in scope for tests:
-      for d in */; do echo $d; done
+      find . -type d -printf '%P\n'
 
 - id: prepare
   name: 'gcr.io/cloud-foundation-cicd/$_DOCKER_IMAGE_DEVELOPER_TOOLS:$_DOCKER_TAG_VERSION_DEVELOPER_TOOLS'