New comment by dkwo on void-packages repository

https://github.com/void-linux/void-packages/pull/42248#issuecomment-1430222020

Comment:
This allows passwords to be specified in a separate file from the main config using e.g.
```
$ cat wpa_supplicant/wpa_supplicant-wlp4s0.conf 
...
ext_password_backend=file:/etc/wpa_supplicant/wifi-passwords.conf

network={
	ssid="ItsName"
	psk=ext:psk_of_some
}
```
together with
```
doas cat /etc/wpa_supplicant/wifi-passwords.conf 
psk_of_some=the_actual_password
```
According to https://github.com/NixOS/nixpkgs/pull/180872 it doesn't work with WPA3 SAE passwords, but patches have been accepted upstream fixing that.