[retro-gtk/build-doc] ci: Add a missing stage

[Adrien Plazas <aplazas src gnome org>]

commit b2a81b9fb9785ee51af1bb37e5a9946d8ede526f
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Apr 12 09:58:37 2020 +0200

    ci: Add a missing stage

 .gitlab-ci.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 74f031c..079ea9a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,6 +4,7 @@ stages:
   - doc
   - test
   - review
+  - publish
 
 api-visibility:
   stage: lint
@@ -130,7 +131,7 @@ stop_review:
     - tags
 
 pages:
-  stage: deploy
+  stage: publish
   script:
     - mv _reference/ public/
   artifacts: