Changes docker image in an attempt to work around a symlink bug

Author: StuntsPT

.gitlab-ci.yml

@@ -4,7 +4,7 @@ stages:
   - field_test
 #  - deploy
 
-image: python:3.5-alpine3.7
+image: python:3.5-slim-jessie
 
 # Change pip's cache directory to be inside the project directory since we can
 # only cache local items.