Setup CI/CD with Heroku, Docker & CircleCI

config.yml

version: 2
jobs:
  build:
    docker:
      - image: python:3.5
        environment:
          MYSQL_HOST: 127.0.0.1
          MYSQL_DB: mydb
          MYSQL_USER: root
          MYSQL_PASSWORD: root
      - image: mysql:5.6
        environment:
          MYSQL_ROOT_PASSWORD: root
          MYSQL_DATABASE: mydb
    steps:
      - checkout

      - restore_cache:
          key: deps1-{{ .Branch }}-{{ checksum "requirements.txt" }}

      - run:
          name: Install dependencies
          command: |
            python3 -m venv venv
            . venv/bin/activate
            pip install -r requirements.txt
      - save_cache:
          key: deps1-{{ .Branch }}-{{ checksum "requirements.txt" }}
          paths:
            - "venv"

      - run:
          name: Install dockerize
          command: wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz && tar -C /usr/local/bin -xzvf dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz && rm dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz
          environment:
            DOCKERIZE_VERSION: v0.3.0

      - run:
          name: Wait for MySQL
          command: dockerize -wait tcp://localhost:3306 -timeout 1m

      - run:
          name: Run unit tests
          command: |
            python3 -m venv venv
            . venv/bin/activate
            python app/tests.py
      - setup_remote_docker

      - run:
          name: Install Docker client
          command: |
            set -x
            VER="17.03.0-ce"
            curl -L -o /tmp/docker-$VER.tgz https://get.docker.com/builds/Linux/x86_64/docker-$VER.tgz
            tar -xz -C /tmp -f /tmp/docker-$VER.tgz
            mv /tmp/docker/* /usr/bin
      - run:
         name: Build Docker image
         command: docker build -t mlabouardy/movies-store:$CIRCLE_SHA1 .

      - run:
          name: Push to DockerHub
          command: |
            docker login -u$DOCKERHUB_LOGIN -p$DOCKERHUB_PASSWORD
            docker push mlabouardy/movies-store:$CIRCLE_SHA1
      - run:
          name: Setup Heroku
          command: |
            chmod +x .circleci/setup-heroku.sh
            .circleci/setup-heroku.sh
      - run:
          name: Deploy to Heroku
          command: |
            cd app/
            git push heroku master

I this case it will not push docker image to heroku it will just run app directly on host?