Change CI global befor_script to stage local before_script

.gitlab-ci.yml

 image: python:3.6
 image: python:3.6
 
 
-before_script:
-  - pip install flake8
-  - pip install pipenv
-  - pipenv install
-
 stages:
 stages:
   - lint
   - lint
   - test
   - test
 
 
 flake8:
 flake8:
+  before_script:
+    - pip install flake8
   stage: lint
   stage: lint
   script:
   script:
     - flake8 --max-line-length=125 --exclude=migrations
     - flake8 --max-line-length=125 --exclude=migrations
 
 
 test:
 test:
+  before_script:
+    - pip install pipenv
+    - pipenv install
   script:
   script:
   - cd recircle
   - cd recircle
   - pipenv run python manage.py test
   - pipenv run python manage.py test
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