[libadwaita/wip/exalm/ci] ci: Explicitly specify refresh-doc image

[Alexander Mikhaylenko <alexm src gnome org>]

commit 55c1dbf1cfc3b4cb27ef582ef5d6ddf6246d603b
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Jun 1 15:31:37 2022 +0400

    ci: Explicitly specify refresh-doc image
    
    For some reason it's debian sometimes.

 .gitlab-ci.yml | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3871ea10..b2137be6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -56,6 +56,7 @@ abi-check:
     - ./.gitlab-ci/check-abi ${LAST_ABI_BREAK} $(git rev-parse HEAD)
 
 refresh-doc:
+  image: fedora
   stage: publish
   only:
     refs: