[librsvg/wip/davidk/gtk-doc-configure] CI: Always build the reference docs on branch pipelines, not just the main branch

[Federico Mena Quintero <federico src gnome org>]

commit 056369fba5adbf393097b19df06814c024af35fb
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri May 13 12:56:24 2022 -0500

    CI: Always build the reference docs on branch pipelines, not just the main branch
    
    Otherwise we don't know if a branch breaks the docs.

 .gitlab-ci.yml | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 75488965d..c999fc312 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -388,8 +388,6 @@ reference:
   artifacts:
     paths:
       - public
-  rules:
-    - if: '$CI_COMMIT_BRANCH == "main"'
 
 pages:
   stage: docs