Merge branch '10-use-rules-instead-of-only-in-gitlab-ci' into 'develop'

feat: use rules instead of only in gitlab-ci script

See merge request core-services/pages-jekyll-lcsb-template!17

.gitlab-ci.yml

@@ -20,8 +20,8 @@ build the website:
 
 pages:
   stage: deploy
-  only:
-  - master
+  rules: 
+    - if: $CI_COMMIT_BRANCH == "master"
   script:
   - mv test public
   - echo "Your website is available at $CI_PAGES_URL"