allow predictable network interfaces

on dual-eth-raspi:
- eth0 -> end0
- eth1 -> enx...

utils.py

@@ -95,7 +95,7 @@ class BoxInfo:
                     ifname = f'eth{int(ifname[3]) - 1}'
                 with open(ifdev) as f:
                     self.network_interfaces[ifname] = addr = f.read().strip().lower()
-                if ifname in ('eth0', 'enp1s0'):
+                if ifname in ('eth0', 'enp1s0', 'end0'):
                     macaddr = addr
                     self.main_if = ifname
         self.macaddr = macaddr