MAINT: update documentation only in main

.gitlab-ci.yml

@@ -93,15 +93,12 @@ build-testenv:
 
 # Build the sphinx documentation and make it ready for deployment by Gitlab Pages
 # Special job for serving a static website. See https://docs.gitlab.com/ee/ci/yaml/README.html#pages
-pages:
+pages_prepare: &pages_prepare
+  tags: [ cached-dind ]
   stage: deploy
   only:
     refs:
       - /^release-.*$/i
-      - main
-    variables:
-      # run pages only on gitlab.com
-      - $CI_SERVER_HOST == "gitlab.com"
   script:
     - echo "Deploying"
     - make doc
@@ -109,3 +106,8 @@ pages:
   artifacts:
     paths:
       - public
+pages:
+  <<: *pages_prepare
+  only:
+    refs:
+      - main