Try docker in CI

.gitlab-ci.yml

 image: python:3.6
 
 before_script:
+  - docker info
   - git submodule sync --recursive
   - git submodule update --init --recursive
 
@@ -9,11 +10,11 @@ flake8:
     - pip install flake8
     - flake8
 
+build-local:
+  script:
+    - docker build --tag recircle-backend:1.0 .
+
 test:
   script:
-    - pip install pipenv
-    - pipenv install -d
-    - mv environment.sh.example environment.sh
-    - pipenv run source environment.sh
-    - cd recircle
-    - pipenv run python manage.py test
+    - mv .env.example .env
+    - docker run recircle-backend pipenv run python manage.py test