Turn of cache dir to save memory.

.drone.yml

@@ -11,7 +11,7 @@ steps:
       DJANGO_SETTINGS_MODULE: config.settings.test
     commands:
       - 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
+      - cp -n env.example .env
       - mkdir -p ./cache/packages ./cache/pip
       - pip install --user --cache-dir ./cache/pip -r ./requirements/test.txt
       - python manage.py compilescss