6ec38c33d7
By default /etc/passwd in container build sandboxes have two users (root,nixbld) mapped to root. This confuses nix especially it behaves different if it runs as root. setuid/setgid() is not enough because ssh will break if the current uid does not exist in /etc/passwd. Along with this we now also only run the setup for setting up the network bridge and cgroup filesystems once and not per container.