As other people have noted, there are issues trying to connect the CB1 to wifi after the first boot. I believe I've narrowed down the cause, but I'm not sure about the right way to fix it permanently.
The issue I was experiencing is as follows:
1. Flash latest armbian minimal to sd card
2. Plug into CB1 and turn it on
3. Go through first boot setup and connect to wifi normally
4. Reboot CB1
5. CB1 no longer connects to wifi, wpa_cli says 'CTRL_EVENT_SCAN_FAILED'
A temporary solution I found is to mask systemd-networkd, then manually unmask systemd-networkd and start it after booting. This suggests that the problem is that systemd-networkd tries to talk to the RTL8189 before it's ready, and that puts the chip into a bad state. The wireless connection works on the first boot, because the CB1 doesn't try to configure the chip until after it has booted up.
If I only mask netplan-wpa-wlan0 (instead of masking networkd) and try to manually bring it up, then I get an empty scan result, rather than CTRL_EVENT_SCAN_FAILED.
Is there a way to make systemd-networkd wait until after the driver has loaded before trying to configure the chip? The easiest temporary solution is probably to just add a delay before systemd-networkd starts.
