Alternative to connman for network config settings on k3os

[j-landru]

Is your feature request related to a problem? Please describe.

Context
In an attempt to deploy an IPv6 only cluster on k3os, I'd like to set several addresses on my network node interfaces with predictable fixed Interface ID. As I'm not familiar with connman config settings and legacy Alpine networking config service with its /etc/network/interfaces file is still usable on k3os, I swap back on that later config.

Describe alternatives you've considered

I) set your network config : Export your /etc/network/interfaces file in the write_file k3os stanza config step.

II) Swap connman with networking at boot runlevel : Swap connman with Alpine networking at the boot openrc runlevel using rc-update del connman boot followed by rc-update add networking boot commands in the boot_cmd k3os config stanza.

Additional context
I published some more detailed personal notes as an howto on an alternate gitlab portal, https://framagit.org/-/snippets/6442 , hoping this can be useful for others.