Run tests as part of gitlab CI

.gitlab-ci.yml

@@ -1,9 +1,18 @@
 stages:
+  - test
   - build
   - deploy:images
   - deploy:pypi
   - deploy:docs
 
+test:
+  script:
+    - apk add --no-cache make gcc musl-dev yaml-dev
+    - python setup.py install
+    - pip install -r requirements/dev.txt
+    - pip install twine
+    - make test
+
 build:images:
   script:
     - apk add --no-cache docker make