[ECR] [Scanning] how to fix UnsupportedImageError: The operating system and/or package manager are not supported.

pull elxrlinux/elxr:12.9.0.0

and
push it to ECR

Get error like:
UnsupportedImageError: The operating system and/or package manager are not supported.

Check os-release:
root@940cede1cbe5:/home# cat /etc/os-release
PRETTY_NAME="eLxr 12 (aria)"
NAME="eLxr"
VARIANT="Server Edition"
VARIANT_ID=server
VERSION_ID="12"
VERSION="12 (aria)"
VERSION_CODENAME=aria
ID=elxr
ID_LIKE=debian
HOME_URL="https://elxr.dev"
SUPPORT_URL="https://elxr.dev"
BUG_REPORT_URL="https://gitlab.com/groups/elxr/-/issues"

Start with the ECR image-scanning entry point described in the report and reproduce the error using elxrlinux/elxr:12.9.0.0. Compare the image's /etc/os-release values with ECR's supported operating systems and package managers; done means determining whether this image can be supported or documenting the limitation and expected resolution.

Written by the indexing model from the issue text.