Detect IPv6 automatically, Rewrite kexec url #304
Merged
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This uses ip r g 1.1.1.1 to test if there's any route to an IPv4 internet host
If that fails and the url is a github.com one it will change github.com to gh-v6.com,
as specified in the documentation
This saves the user from an extra manual step and makes nixos-anywhere better
The fallback behaviour if the ip binary cannot be found is to just assume ipv4 connectivity. I can invert that if wanted.