Enhance hack/check-samples.sh to output difference in dir structure.

Some of the files in the examples directory could be ignored by
git e.g. integration/examples/jib-multimodule/target if developers
.gitconfig ignore target dir everywhere.

Since this script does a file comparison, debugging failures in such
situation takes times.

Co-authored-by: Balint Pato <[email protected]>

Author: tejal29

hack/check-samples.sh

@@ -21,6 +21,7 @@ INTEGRATION_EXAMPLES=$(find integration/examples -mindepth 1 -maxdepth 1 -type d
 
 if [[ "${EXAMPLES}" != "${INTEGRATION_EXAMPLES}" ]]; then
   echo "Every code sample that is in ./examples should also be in ./integration/examples"
+  diff --label "1" --label "2"  <(printf "examples:\n${EXAMPLES}" ) <(printf "integration/examples:\n${INTEGRATION_EXAMPLES}")
   exit 1
 fi