Fix empty system context when copy image from oci-archive transport

[tyler92]

Images runtime used the OCI archive transport with an empty system context, so such environment variables from user like TMDDIR were ignored.

Before this fix Podman used "/var/tmp" even if TMPDIR is set by user while using podman load with oci-archive transport.

$ podman save -o image.tar docker.io/library/debian:latest
$ TMPDIR=~/test/tmp podman --log-level=debug load -i ./image.tar | grep "/var/tmp"
DEBU[0000] Error loading ./image.tar (oci-archive): loading index: open /var/tmp/oci82198972/index.json: no such file or directory

Fixes: containers/podman#16104

Signed-off-by: Mikhail Khachayants tyler92@inbox.ru

[rhatdan]

LGTM

[rhatdan]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rhatdan, tyler92

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[rhatdan]

@mheon PTAL
@vrothberg @mtrmac PTAL

[mheon]

Sure, LGTM

[rhatdan]

/lgtm