[bug#46216] [PATCH] Remove duplication in tests/publish.scm

[Maxime Devos]

Hi Guix!

In https://issues.guix.gnu.org/46214, I proposed
a draft patch for adding a ‘hook’ mechanism to
guix publish.  Now I would like to write some tests.

However, it seems the following construct is duplicated
for many tests:

   (call-with-new-thread
    (lambda ()
      (guix-publish "--port=PORT" et cetera)))
                        
This patch series introduces some abstraction.
Currently, there is only one patch yet, but more
will follow.

"make check TESTS=tests/publish.scm" still succeeds.
(Guix version: 23a5dcce1d893b8f5c5301ae3c1af863776ed3cf
with some not-yet-upstreamed changes).

Maxime
-- 
Maxime Devos <maximedevos@telenet.be>
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