/etc/cni has to be readable for non-root users (0755), because /etc/cni/tuning/allowlist.conf is used for rootless mode too.
This file was introduced in CNI plugins 1.2.0 (containernetworking/plugins PR 693), and its path is hard-coded.
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>