ci: fix push path filter to match files inside sysroot_scripts directory

[codebytere]

The paths filter sysroot_scripts only matches the directory entry itself, not files within it. This means pushes that modify files like sysroot_creator.py or build_and_upload.py inside the directory would not trigger the workflow.

Changed to build/linux/sysroot_scripts/** which uses a glob pattern to match any file at any depth within the directory.