Add an oci-image feature testsuite that runs against installed artifacts
on Docker rootful, Podman rootful, and Podman rootless tmachine guests.
It covers custom WORKDIR placement, image content and ownership,
workspace writes from the main process and exec, file transfer, OCI
user identity, the managed /sandbox fallback, and rejection of an
unwritable WORKDIR.
Replace the Docker-only custom_image e2e with the shared suite and keep
podman_oci_identity focused on Podman image-ID pinning and identity.
Signed-off-by: Matthew Grossman <mgrossman@nvidia.com>
Matthew Grossman
0f3bdfb1c6