Update pipeline to check types and formatting

.gitlab-ci.yml

@@ -3,6 +3,26 @@
 #   * Author: (c) 2011-present GitLab B.V.
 #   * URL: https://docs.gitlab.com/ee/ci/docker/using_kaniko.html#building-a-docker-image-with-kaniko
 #   * License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)
+stages:
+    - test
+    - build
+
+variables:
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+
+testing:
+    image: python:latest
+    cache: 
+      paths:
+        - .cache/pip
+    stage: test
+    before_script:
+        - pip install pipenv
+        - pipenv requirements --dev > requirements.txt
+        - pip install -r requirements.txt 
+    script:
+        - black --check $CI_PROJECT_DIR
+        - mypy .
 
 docker-build:
     image:
@@ -17,3 +37,4 @@ docker-build:
         - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
     only:
         - master
+    needs: [testing]