Add new file

.gitlab-ci.yml

+# Build CollectionBuilder using Jekyll
+
+# use Ruby image that matches the version you are using locally
+image: ruby:3.1
+
+# set to production environment build
+variables:
+  JEKYLL_ENV: production
+  LC_ALL: C.UTF-8
+
+# install bundler, then install from Gemfile
+before_script:
+  - gem install bundler
+  - bundle install
+
+# build and deploy site
+pages:
+  stage: deploy
+  script:
+    - bundle exec jekyll build -d public
+  artifacts:
+    paths:
+      - public
+  only:
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH