This script allows you to toggle tailscale settings using the physical side switch on the GL-iNet Beryl AX.
To install, copy the below file to /etc/gl-switch.d/tailscale.sh and replace the exit_node_ip value with your exit node ip address.
Make sure to set the execute bit on the new file: chmod +x /etc/gl-switch.d/tailscale.sh
Then go to System -> Toggle Button Settings and choose Tailscale (On/Off) in the dropdown and Apply