Turn of cache dir to save memory.

.drone.yml

@@ -10,16 +10,13 @@ steps:
       - source: DOCKER_PASS
         target: password
     settings:
-      username:
-        from_secret: DOCKER_USER
-      password:
-        from_secret: DOCKER_PASS
       repo: mhackspace-python
       dockerfile: ./compose/django/Dockerfile
       auto_tag: true
       repo: docker.digitaloctave.com/do-registry
       registry: docker.digitaloctave.com
 
+
   - name: tests
     image: python:3.6-alpine
     environment:
@@ -31,7 +28,7 @@ steps:
       - apk add git build-base gcc python3-dev postgresql-dev musl-dev jpeg-dev zlib-dev openjpeg-dev tiff-dev libffi-dev freetype-dev libev-dev lcms2-dev tk-dev tcl-dev harfbuzz-dev fribidi-dev libxslt-dev
       - cp env.example .env
       - mkdir -p ./cache/packages ./cache/pip
-      - pip install -r ./requirements/test.txt
+      - pip install --user --cache-dir ./cache/pip -r ./requirements/test.txt
       - python manage.py compilescss 
       - python manage.py collectstatic --no-input 
       - pytest -v