[bug#46031] services: cuirass: Add "simple-cuirass-services".

[Mathieu Othacehe <othacehe@gnu.org>]

Hello Jonathan,

> (services
>   (cons*
>     (service a-service-type)
>     [...]
>     (service z-service-type)
>     (modify-services %base-services
>       (guix-service-type config =>
>         (guix-configuration
>           (inherit config)
>           (extra-options '("--cores=x")))))))

That would impose to write something like:

--8<---------------cut here---------------start------------->8---
(services
 (append
  (cons*
    (service a-service-type)
    [...]
    (service z-service-type)
    (modify-services %base-services
      (guix-service-type config =>
        (guix-configuration
          (inherit config)
          (extra-options '("--cores=x"))))))
  (simple-cuirass-services
   (simple-cuirass-configuration
    (build 'all)
    (channels (cons (channel
                   (name 'my-guix)
                   (url "https://my-git-repo/guix.git"))
                  %default-channels))))))
--8<---------------cut here---------------end--------------->8---

which is admittedly not that elegant. The problem I'd like to hide that
"postgresql-service-type" and "postgresql-role-service-type" are
required by Cuirass. Any idea?

Thanks,

Mathieu