ssh-agent does nothing

[Jérémy Korwin-Zmijowski]

Dear Guixters,

I am having trouble to git clone/pull/push from/to repositories relying
on ssh authentication (i.e. git clone git@framagit.org:Jeko/dummy-
project-name.git).

I tried to follow few instructions found on the mailing list but I get
stuck when I see in my terminal `ssh-agent` returning nothing.

(Guix OS + Gnome DE)

Thank you for your help. Take care,

Jérémy