How to disable onboard WiFi Pi 3 on deployed instance?

raspberrypi3
wifi

#1

I’m using an external WiFi connector on my Pi 3. Is there a way to disable the onboard Pi 3 Wifi in Resin after the image has been created? i.e. can I set a flag/environment variable to do this or can I modify setting outside the docker container like the config.txt dtoverlay=pi3-disable-wifi etc