gnu: home: services: Add home-git-annex-assistant-service-type

* gnu/home/services/git-annex-assistant.scm: New file.
* gnu/local/mk (GNU_SYSTEM_MODULES): Register it.
* doc/guix.texi (Miscellaneous Services): Document it.

Change-Id: I9ca75210dfe7f6d2d81b9eb8919d6eb34c7bb002
Signed-off-by: Ian Eure <ian@retrospec.tv>

doc/guix.texi

@@ -150,6 +150,7 @@ Copyright @copyright{} 2025 dan@*
 Copyright @copyright{} 2025 Noé Lopez@*
 Copyright @copyright{} 2026 David Elsing@*
 Copyright @copyright{} 2026 Nguyễn Gia Phong@*
+Copyright @copyright{} 2026 Yarl Baudig@*
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -55053,6 +55054,45 @@ You may specify a custom configuration by providing a
                        '(("grafana:/var/lib/grafana"))))))))
 @end lisp
 
+@subsubheading git-annex assistant Service
+
+@cindex git-annex assistant service
+The @code{(gnu home services git-annex-assistant)} module provides a
+service to run the @uref{https://git-annex.branchable.com/assistant/,
+git-annex assistant}.
+
+@defvar home-git-annex-assistant-service-type
+This is the type of the service that runs the assistant.  You must
+supply a @code{<home-git-annex-assistant-configuration>}.
+
+The service runs one assistant for each directory provided.  For
+example:
+
+@lisp
+(service home-git-annex-assistant-service-type
+         (home-git-annex-assistant-configuration
+           (directories '("/path/to/foo" "/path/to/bar"))))
+@end lisp
+@end defvar
+
+@c %start of fragment
+
+@deftp {Data Type} home-git-annex-assistant-configuration
+Available @code{home-git-annex-assistant-configuration} fields are:
+
+@table @asis
+@item @code{package} (default: @code{git-annex}) (type: package)
+Package that provides @code{git-annex}.
+
+@item @code{directories} (default: @code{()}) (type: list-of-strings)
+List of directories.
+
+@end table
+
+@end deftp
+
+@c %end of fragment
+
 @node Invoking guix home
 @section Invoking @command{guix home}