Personal notes https://pi3g.com/2019/01/10/alpine-boot-process-on-the-raspberry-pi/
https://wiki.alpinelinux.org/wiki/Setting_up_a_OpenVPN_server
https://wiki.alpinelinux.org/wiki/Running_Alpine_Linux_As_a_QEMU_networked_Guest
https://wiki.alpinelinux.org/wiki/Installing_Alpine_Linux_in_a_chroot