image-rs | Add tests for odd images

[Xynnn007]

There are some corner cases where image-rs once could not work but we introduce patches, we need a test suites to cover them everytime we introduce new patches.

• Duplicated layers: "gcr.io/k8s-staging-cloud-provider-ibm/ibm-vpc-block-csi-driver:master" (Just pull)
• whiteouts (Needs to build image and post-pulling check) image-rs: Whiteout conversion skipped entirely when xattr check fails, causing deleted files to reappear #1210

FROM debian:stable-slim
RUN apt-get update && apt-get install -qy apache2
RUN rm -rf /etc/apache2
CMD ["find", "/etc/apache2"]

• whiteout issue II: "agnhost:2.21" (Just pull)

[mkulke]

can we mirror those images in the ghcr.io of this repository? we can add the source as an oci label/annotation maybe