[bug#70265] Add docker cli Guix Home service and some docker authentication plugins

[paul]

Hello Guixers,


I'm sending a patchset to:


- add two docker cli authentication plugins for libsecret and pass 
respectively

- a Guix Home service to make the docker cli aware of Guix provided 
plugins. this could be used for docker compose v2 in the future ( I 
actually do use it now with a binary package and it works as far as I 
can tell).


Thank you for your work,

giacomo