Revert "ci: temporarily allow failure so it will build image"

This reverts commit 810d7d31c8.

.gitlab-ci.yml

@@ -48,7 +48,6 @@ test:pytest:
     - pip install -r requirements.txt --quiet
     - pip install pytest
     - DISABLE_METRICS=true python -m pytest tests
-  allow_failure: true
 
 test:pylint:
   script:
@@ -65,7 +64,6 @@ test:migration:
     - cp config.yaml.example config.yaml
     - pip install -r requirements.txt --quiet
     - sh scripts/test_migrate.sh
-  allow_failure: true
 
 pages:
   stage: deploy