jf scan failed to index tar file as container image and exits with an unexpected exit code

Describe the bug

jf scan failed to index tar file downloaded with skopeo as container image. I've tried that with oci and v2 format (see logs below). Also the command exits with Scan completed successfully. and exit code 0 wich is unexpected.

Background: I would like to scan container images without running docker cli and docker socket on my agent.

This may be related to jfrog/jfrog-cli-security#350 and jfrog/jfrog-cli-security#340.

Current behavior

# print jf version
$ jf --version
jf version 2.51.1

# download image in oci format
$ skopeo copy --format oci docker://ubuntu:22.04 oci-archive:scan_target_oci.tar
Getting image source signatures
Copying blob aece8493d397 done
Copying config e4c5895818 done
Writing manifest to image destination
Storing signatures

# download image in v2s2 format
$ skopeo copy --format v2s2 docker://ubuntu:22.04 docker-archive:scan_target_v2s2.tar
Getting image source signatures
Copying blob aece8493d397 done
Copying config e4c5895818 done
Writing manifest to image destination
Storing signatures

# scan oci image
$ JFROG_CLI_LOG_LEVEL=DEBUG jf scan scan_target_oci.tar > scan_target_oci_out.txt 2>&1
$ echo $?
0

# scan v2s2 image
$ JFROG_CLI_LOG_LEVEL=DEBUG jf scan scan_target_v2s2.tar > scan_target_v2s2_out.txt 2>&1
$ echo $?
0

I censored our private domain with <**censored**>. Here is the log output:

scan_target_oci_out.txt
scan_target_v2s2_out.txt

Reproduction steps

See Current behavior

Expected behavior

First of all I expected the scan to work because the tar archieves are recognized as container images.
Then I expected the Failed to index tar file as container image to be an ERROR instead of an WARN.
Furthermore I expected the command to fail if such error occurs and exit with a non-zero exit code.

JFrog CLI version

jf version 2.51.1

Operating system type and version

Ubuntu 22.04.3 LTS

JFrog Artifactory version

{"version":"7.68.14","revision":"76814900"}

JFrog Xray version

{"xray_version":"3.85.5","xray_revision":"8ef6b2d"}

Start at the jf scan command's tar-file indexing and exit-status handling, using the attached OCI and v2s2 logs as reproduction evidence. Verify behavior with the skopeo-generated archives and ensure indexing succeeds or reports an ERROR, with a non-zero exit code when scanning fails.