Update .gitlab-ci.yml

Author: KevinRoebert

.gitlab-ci.yml

@@ -55,6 +55,8 @@ pages:
     - sha256sum public/data/data.min.json | awk '{print $1}' > public/data/rules.min.hash
     - node build_tools/minifyDataJSON.js "public/data/data.min.json" "public/data/data.minify.json"
     - sha256sum public/data/data.minify.json | awk '{print $1}' > public/data/rules.minify.hash
+  only:
+    - master
   artifacts:
     paths:
       - public