nixos-containers.nix sets networking.useDHCP = false for every
container (to suppress the deprecated global DHCP warning). Setting
networking.useDHCP = true in the hive-ci inner config conflicts with
no priority differential → eval error on hosts running current main.
Fix: drop the global useDHCP = true and configure DHCP on eth0
(the inner veth interface name assigned by systemd-nspawn when
hostBridge is used). This is both conflict-free and the correct
modern NixOS practice for per-interface DHCP.
c0a49c95c1