add deploy pipeline

.gitlab-ci.yml

@@ -2,6 +2,7 @@ image: alpine:latest
 
 stages:
   - test
+  - deploy
 
 services:
   - postgres:latest
@@ -22,3 +23,17 @@ Testing:
   script:
     - coverage run --source=accounts,lists manage.py test
     - coverage report -m
+
+Deployment:
+  image: ruby:2.4
+  stage: deploy
+  before_script:
+    - gem install dpl
+    - wget -qO- https://cli-assets.heroku.com/install-ubuntu.sh | sh
+  script:
+    - dpl --provider=heroku --app=$HEROKU_APPNAME --api-key=$HEROKU_APIKEY
+    - export HEROKU_API_KEY=$HEROKU_APIKEY
+    - heroku run --app $HEROKU_APPNAME migrate
+  environment:
+    name: production
+    url: $HEROKU_APP_HOST