Pi: Support headless installation
I love to use Alpine on my Raspberry Pis. But it is a pain to use classic sys [1] installation without a keyboard and monitor.
Please allow to enable ssh on initial startup with a simple "ssh" file like raspbian does. [2] This is all I need and is so helpful!
[1] https://wiki.alpinelinux.org/wiki/Classic_install_or_sys_mode_on_Raspberry_Pi [2] https://www.raspberrypi.org/documentation/configuration/wireless/headless.md