docker-compose build でエラーが出る

前提

dockerでアプリが立ち上がるように実装しいざdocker-compose buildを実行すると
You must use Bundler 2 or greater with this lockfile.というエラーが発生しました。

実現したいこと

コンテナを起動できるようにしたい

発生している問題・エラーメッセージ

=> ERROR [6/7] RUN gem install bundler && bundle install                                                                                                                                 1.8s
------                                                                                                                                                                                         
 > [6/7] RUN gem install bundler && bundle install:                                                                                                                                            
#9 1.506 Successfully installed bundler-2.3.19
#9 1.506 1 gem installed
#9 1.787 You must use Bundler 2 or greater with this lockfile.
------
executor failed running [/bin/sh -c gem install bundler && bundle install]: exit code: 20
ERROR: Service 'app' failed to build : Build failed

該当のソースコード

docker-compose.yml

version: '3'
services:
  app:
    build:
      context: .
    command: bundle exec puma -C config/puma.rb

    volumes:
      - .:/portfolio
      - public-data:/portfolio/public
      - tmp-data:/portfolio/tmp
      - log-data:/portfolio/log
    networks:
      - portfolio-network
    depends_on:
      - db

  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_USER: user
      MYSQL_PASSWORD: password
      MYSQL_DATABASE: portfolio_development
    volumes:
      - db-data:/var/lib/mysql
    networks:
      - portfolio-network

  web:
    build:
      context: ./nginx_docker
    volumes:
      - public-data:/portfolio/public
      - tmp-data:/portfolio/tmp
    ports:
      - 80:80
    depends_on:
      - app
    networks:
      - portfolio-network

volumes:
  public-data:
  tmp-data:
  log-data:
  db-data:

networks:
  portfolio-network:
    external: true

Dockerfile

FROM ruby:2.5.1

RUN apt-get update -qq && \
  apt-get install -y build-essential \
  nodejs\
  mysql-server\
  mysql-client

WORKDIR /portfolio

COPY Gemfile /portfolio//Gemfile
COPY Gemfile.lock /portfolio//Gemfile.lock

RUN gem install bundler && bundle install

RUN mkdir -p tmp/sockets