buildah-remote-oci-ta task will left a emtpy /cachi2 folder in the target container image

[shi2wei3]

I can reproduce this issue with bootc image after switch to buildah-remote-oci-ta task, and also find it in tang image which also uses buildah-remote-oci-ta task for building.

$ podman run -ti --rm <bootc-image> ls -l /cachi2
total 0
$ podman run -ti --rm registry.stage.redhat.io/rhel9/tang:9.5 ls -l /cachi2
total 0

[shi2wei3]

Filed a buildah issue to track: containers/buildah#5847

[shi2wei3]

It's because of a default behavior change in buildah containers/buildah#5604 in order to align with docker, and can be changed with the option --compat-volumes.