Installing file outside package in /etc

[phodina]

I'm creating a package for application which needs to install file outside of 
the derivation directory.

The file in question is /etc/sudoers.d but it can be generalized for other 
things like udev etc. I understand this won't be trivial since it modifies the 
system and will probably require some wrapper with higher privileges. However, 
I could not find any section in the Guix reference Manual.

The file is installed in the install phase. Is it the right phase or shall I 
use different? If so how do I patch it?

Also if I compare the contents of GuixSD to NixOS, then the NixOS has more 
files linked to /etc/static/ which then links to /nix/store. Could somebody 
please explain what were/are the thoughts behind this?

Kind regards
Petr Hodina

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