Hi,
After PR #1535 had been merged, the containerd
has enabled the OCI platform string check. But the platform.variant field of OCI for ARM
hadn't been ready at that time, so all ARM images could not be pull successfully.

"ctr pull docker.io/library/hello-world:latest:
resolved |++++++++++++++++++++++++++++++++++++++|
index-sha256:3644c0788e3d3823f9e97f757f01d2ddc6eb5458df9d801:
done |++++++++++++++++++++++++++++++++++++++|
elapsed: 5.1 s
total: 2.7 Ki (533.0 B/s)
unpacking sha256:3d3823f9e97f757f01d2ddc6eb5458df9d801...
ctr: : manifest not found: not found"

I am from ARM. Currently, I am working on arm-multi-arch support for containerd. I had created
a PR #1575 to fix this pull issue on ARM platforms.

Regards,
Wei Chen