remove docker from TravisCI build

.travis.yml

-sudo: required
-
 language: python
 
 python:
   - "3.6"
 
-services:
-  - docker
-
-before_install:
-  # run Docker image in detached mode to be able to issue further commands
-  - docker-compose up -d
-  - docker exec -it oserbackend_app_1 bash
-
 before_script:
+  - cd oser_backend
   - python manage.py makemigrations
   - python manage.py migrate
 

Dockerfile

@@ -3,5 +3,4 @@ EXPOSE 8000
 ADD . /oser-backend
 RUN pip3 install -r oser-backend/requirements.txt
 WORKDIR /oser-backend/oser_backend
-RUN python3 manage.py test
 CMD python3 manage.py runserver 0.0.0.0:8000