Add gitlab ci settings

.gitlab-ci.yml

@@ -0,0 +1,25 @@
+services:
+  - postgres:9.6
+
+variables:
+  POSTGRES_DB: newsreader
+  POSTGRES_USER: newsreader
+
+python tests:
+  image: python:3.7.4-slim-stretch
+  stage: test
+  variables:
+    PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+  cache:
+    key: "$CI_JOB_NAME-$CI_COMMIT_REF_SLUG"
+    paths:
+      - .cache/pip
+      - env/
+  before_script:
+    - python3 -m venv env
+    - source env/bin/activate
+    - pip install -r requirements/gitlab.txt
+  script:
+    - python src/manage.py test newsreader --settings=newsreader.conf.gitlab
+    - isort -rc src/ --check-only
+    - black -l 100 --check src/