MFE-6 Use Redis to cache SAP responses

https://jira.usit.uio.no/browse/MFE-6

.gitlab-ci.yml

@@ -7,6 +7,8 @@ test_backend:
   script:
     - pip install poetry
     - poetry install --no-interaction --no-ansi
+    - test -f config.yaml || cp config.example.yaml config.yaml
+    - mkdir -p frontend/dist
     - poetry run coverage run --source='.' -m pytest
     - poetry run coverage xml
     - poetry run coverage report