Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -13,5 +13,5 @@ cache:
 deploy_site:
   stage: deploy
   script:
-    - bundle install --path=vendor/
-    - bundle exec jekyll build
+    - env LANG=en_US.UTF-8 bundle install --path=vendor/
+    - env LANG=en_US.UTF-8 bundle exec jekyll build