easy to break wifi completely when using own wpa_supplicant.conf in /boot

[Nicolas]

Many people need a headless setup and ssh connectivity. Google leads to this stackexchange

https://raspberrypi.stackexchange.com/questions/10251/prepare-sd-card-for-wifi-on-headless-pi:

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A skeleton wpa_supplicant.conf file can be as little as:

network={
    ssid="YOUR_SSID"
    psk="YOUR_PASSWORD"
    key_mgmt=WPA-PSK
}
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Using this basic config does not work and breaks wifi even in Desktop mode.

Reproduce:
1. create /boot/wpa_supplicant.conf:
network={
    ssid="YOUR_SSID"
    psk="YOUR_PASSWORD"
    key_mgmt=WPA-PSK
}
2. Boot to desktop and click on Connections button top right. It's wonky and you cannot reconfigure wifi

3. Adding
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Solution:
the conf needs to include
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

before automagically copying from /boot to /etc/wpa_supplicant/wpa_supplicant.conf check for

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

being there and add if not. or just document this.