I'm trying to get access to the gpio device on an RPIB+ using a non root, non privileged container. AFAICT, I should map /dev/gpiochip0 using --device, but when I do this, the device appears with broken permissions, group, user (all ?).
I've not tested it on Fedora IoT, nor with an unprivileged container. But I bet that it is a privileges issue on gpiochip0 device file in the base system.