Example docker build command for zephyr dev image does not work for UID/GID != 1000

[rkinder2023]

A bit of a corner case, but the example command to build the dev zephyr docker image does not yield a working container if your UID and GID on the host is != 1000:

docker build -f Dockerfile.devel --build-arg UID=$(id -u) --build-arg GID=$(id -g) -t zephyr-build:v<tag> .

When this runs, the UID and GID are only referred to in the Dockerfile.base, and this file is contained within ci:latest, which is downloaded from docker.io, hence the UID and GID are as per that build.

Perhaps there is a way to build the underlying containers to take in the UID/GID. If so, this should be added to README.md.

My host is Ubuntu 24.04 under wsl.