don't use docker containers for testing

.gitlab-ci.yml

-image: python:3
-
-services:
-    - rabbitmq:3
-
-variables:
-    # makes rabbitmq accessible to the django app (environment variable is used in settings)
-    SAXID_AMQP_HOST: 'rabbitmq'
-
 stages:
     - test 
-
 variables:
     LD_LIBRARY_PATH: /opt/sqlite-compat-django/lib/
 
 before_script:
-    - apt-get update -qqy
-    - apt-get install -qqy python-dev
-    - pip install tox
+    - python3.6 -m venv $HOME/tox
+    - $HOME/tox/bin/pip install tox 
 
 api-test-py3:
     stage: test
-    script: tox -e py36
+    script: $HOME/tox/bin/tox -e 'py36'
     coverage: '/^TOTAL.*\s+(\d+\.\d\%)\s*$/'
-#    allow_failure: true
-