[nautilus] ci: Hardcode image version for style check job

[Ondrej Holy <oholy src gnome org>]

commit 831203e9512b29900e8095c91332b49bbbf97047
Author: Ondrej Holy <oholy redhat com>
Date:   Mon Sep 7 09:27:35 2020 +0200

    ci: Hardcode image version for style check job
    
    The style check job currently fails as uncrustify from rawhide obviously
    changed its behavior. It tries to change function pointer the following
    way:
    
    - gboolean (*each_function)(NautilusCanvasIcon *, gpointer),
    + gboolean ( *each_function )(NautilusCanvasIcon *, gpointer),
    
    I don't think this is right, but don't know how to fix that ellegantly.
    Note that this is because of "sp_before_ptr_star = false". Let's
    hardcode the previous image varsion to avoid this change for now.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 24a397f64..5575159af 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -72,7 +72,7 @@ triage:dry-run:
     when: manual
 
 style check:
-    image: registry.gitlab.gnome.org/gnome/nautilus:latest
+    image: registry.gitlab.gnome.org/gnome/nautilus:v642646
     stage: test
     artifacts:
         name: 'Style check artifacts'