Integrate gitlab-ci/report-image-diff-pattern

Commit: seco-ne/yocto/infrastructure/gitlab-ci@baa7c439

CI: report_image_diff: Fallback to rootfs.tar.gz pattern as default

The default was an empty pattern before, so not working if the distro name was not handled in the code. This way it should match more cases.

Source merge request: seco-ne/yocto/infrastructure/gitlab-ci!440 (merged)

mentioned in merge request seco-ne/yocto/infrastructure/gitlab-ci!440 (merged)

merged