fix issue with LFS

.gitlab-ci.yml

@@ -75,6 +75,8 @@ build pages for VM deployment:
     - if: $CI_COMMIT_BRANCH
     - if: $CI_MERGE_REQUEST_ID
   before_script:
+    - apt-get -qq update
+    - apt-get install -y -qq git-lfs
     - gem install bundler:$BUNDLER_VERSION && bundle install
   script:
     # Generate the configuration for forks (will use Gitlab Pages on personal namespaces)