Remove dependencies of pages job on build job artifacts

`pages` job does not need `build` job artifact. Moreover, as `build` job artifacts expired almost immediately, declaring this unneeded dependency makes `pages` job fail.

.gitlab-ci.yml

@@ -20,8 +20,8 @@ pages:
   stage: deploy
   only:
     - master
-  dependencies:
-    - build
+  # As build job artifact expired (almost) immediately we need to exclude all artifacts generated by the build job from pages job dependencies. Defining an empty array prevent pages job from download build job artifacts.
+  dependencies: []
   script:
     - mkdir -p public/download
     - cd public/download && ../../gitlab-pages/bin/download-page.sh > index.html