Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -0,0 +1,15 @@
+before_script:
+    - apt-get update -qy
+    - apt-get install -y ruby
+    - gem install dpl
+
+stages:
+    - deploy
+
+deploy:
+    stage: deploy
+    image: ruby:latest
+    script:
+        - dpl --provider=heroku --app=$HEROKU_APP_PRODUCTION --api-key=$HEROKU_API_KEY
+    only:
+        - master