Sample circleci config

config.yml

version: 2.1
executors:
  python-executor:
    docker:
      - image: circleci/python:3.7.2
    working_directory: /home/circleci/project

jobs:
  test:
    executor: python-executor

    steps:
      - checkout
      
      - run:
          name: install dependencies
          environment:
            PIPENV_NOSPIN: 1
            PIPENV_VENV_IN_PROJECT: 1
          command: |
            pipenv sync --dev
            mkdir -p test-data/project

      - run:
         name: lint
         command: pipenv run flake8

      - run:
          name: run tests
          command: |
            pipenv run pytest --cov=project -v --junitxml=test-data/project/junit.xml

      - store_test_results:
          path: test-data

      - store_artifacts:
          path: test-data

      - persist_to_workspace:
          root: /home/circleci/
          paths:
            - project


  build:
    executor: python-executor
    steps:
      - attach_workspace:
          at: /home/circleci

      - run:
          name: AWS configure
          command: |
            pipenv run  aws configure set aws_access_key_id $AWS_ACCESS_KEY
            pipenv run  aws configure set aws_secret_access_key $AWS_SECRET_KEY
            cp .circleci/aws_config ~/.aws/config

      - run:
          name: Docker Image
          command: |
            $(pipenv run aws ecr get-login --no-include-email --region $AWS_DEFAULT_REGION --profile bprod)
            docker build -t $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$AWS_ECR_REPONAME:$latest .
            docker push $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$AWS_ECR_REPONAME:$latest

      - persist_to_workspace:
          root: /home/circleci/
          paths:
            - project
            - .aws


  deploy: &deploy
    executor: python-executor
    steps:
      - attach_workspace:
          at: /home/circleci
          
      - run:
          name: deploy fargate
          command: |
            pipenv run python deploy/promote.py $ENVIRONMENT $AWS_PROFILE

  deploy_to_dev:
    <<: *deploy

  deploy_to_uat:
    <<: *deploy

  deploy_to_prod:
    <<: *deploy


workflows:
  version: 2
  test-build-deploy:
    jobs:
      - test
      - build:
          requires:
            - test
          context: org-global

      - deploy_to_dev:
          requires:
            - build
          context: dev
          filters:
            branches:
              only: master

      - deploy_to_uat:
          requires:
            - deploy_to_dev
          context: uat

      - hold:
          type: approval
          requires:
            - deploy_to_uat

      - deploy_to_prod:
          requires:
            - hold
          context: production