System configuration, ~/.profile, custom path etc.

[白い熊＠相撲道]

Hello:

I'm trying to understand the "desired" way to configure GuixSD, 
regarding modifying environment variables etc.

Studying the manual, it seems to me that the system doesn't source 
~/.profile etc. and instead the systematic way to modify the environment 
is via the sysconfig.scm file and system reconfigure.

Namely, I've found the "skeletons" variable, I've tried to undestand the 
example, but not sure I know how to implement it.

Let's say I want to add "~/sh" to PATH and also export TEST="This is a 
test."

How exactly do I add this to sysconfig.scm?

Many thanks.
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白い熊＠相撲道