Add .gitlab-ci.yml

.gitlab-ci.yml

+image: ruby:2.4
+
+cache:
+  paths:
+  - vendor/
+
+variables:
+  GIT_SUBMODULE_STRATEGY: recursive
+  JEKYLL_ENV: production
+
+before_script:
+  - mkdir public
+  - bundle install --path vendor
+  - export LANG=en_US.UTF-8
+  - export LANGUAGE=en_US:en
+  - export LC_ALL=en_US.UTF-8
+
+deploy_production:
+    stage: deploy
+    tags:
+        - courseweb
+    script:
+        - cp _config_production.yml _config.yml
+        - cp _layouts/presentation_production.html _layouts/presentation.html
+        - bundle exec jekyll build -d public
+        - /www/utils/deploycourseweb.sh
+    variables:
+        quarter: eg21wi
+        course: egcse340
+        source_path: public
+    only:
+        refs:
+            - egCSE340-WI21