GitLab Pages require the job name to be "pages"

See:
https://docs.gitlab.com/ee/ci/yaml/README.html#pages
https://docs.gitlab.com/ee/user/project/pages/introduction.html#gitlab-pages-requirements

defaults/gitlab-ci.yml

@@ -7,7 +7,7 @@ Julia {{VERSION}}:
     - julia -e 'using Printf; using Pkg; Pkg.add("Coverage"); using Coverage; c, t = get_summary(process_folder()); @printf "Test Coverage %.2f%%\n" 100c/t'
 {{/GITLABCOVERAGE}}
 {{#DOCUMENTER}}
-Documentation:
+pages:
   image: julia:{{VERSION}}
   stage: deploy
   script: