ci: display git diff instead of status

git diff explains better what changed than git status.

Signed-off-by: Paul <paul.marechal@ericsson.com>

scripts/check_git_status.sh

@@ -2,7 +2,7 @@
 if [ $(git status --porcelain | wc -c) -gt 0 ];
 then
     echo "\nERR: The git repository state changed after the build, this should not happen.\n"
-    git status
+    git --no-pager diff
     echo "\nHINT: Did you update and commit your 'yarn.lock' ?"
     echo "\n      You can also check your '.gitgnore'."
     exit 1