Update pipeline to check types and formatting

#   * 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:

        - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG

    only:

        - master

    needs: [testing]