circleCIにbuild中Gem::GemNotFoundExceptionが出る

前提・実現したいこと

docker環境,railsアプリをcircleCIでbuildしているとGemNotFoundExceptionのエラーが出てしまいます。下記記事を参考にbuild, rspec, rubocopをクリアしたら自動でdeployされるようにしたいです。
https://qiita.com/g_ayushi/items/276b93d8e1a61a9f97b3

発生している問題・エラーメッセージ

Traceback (most recent call last):
	2: from /usr/local/bin/bundle:23:in `<main>'
	1: from /usr/local/lib/ruby/site_ruby/2.5.0/rubygems.rb:308:in `activate_bin_path'
/usr/local/lib/ruby/site_ruby/2.5.0/rubygems.rb:289:in `find_spec_for_exe': can't find gem bundler (>= 0.a) with executable bundle (Gem::GemNotFoundException)

該当のソースコード

config.yml

version: 2.1
orbs:
  ruby-orbs: sue445/ruby-orbs@1.6.0
  heroku: circleci/heroku@1.0.1

workflows:
  version: 2.1
  build:
    jobs:
      - rspec
      - rubocop
      - heroku_deploy:
          requires:
            - rspec
            - rubocop

executors:
  default:
    working_directory: ~/okonomiyakidb
    docker:
      - image: ruby:2.5.0-stretch
        environment:
          BUNDLE_PATH: vendor/bundle
          RAILS_ENV: test
          BUNDLER_VERSION: 2.2.22

jobs:
  build:
    executor: default
    steps:
      - checkout
      - bundle-install
  rubocop:
    executor: default
    steps:
      - preparate
      - run:
          name: Rubocop
          command: bundle exec rubocop --require rubocop-airbnb
  rspec:
    executor: default
    steps:
      - preparate
      - run: bundle exec rails db:create
      - run: bundle exec rails db:schema:load
      - run:
          name: Rspec
          command: bundle exec rspec
  heroku_deploy:
    executor: heroku/default
    parameters:
      app-name: 
        default: $HEROKU_APP_NAME_PRD
        type: string
      post-deploy:
        default:
          - run:
              command: heroku run rails db:migrate --app $HEROKU_APP_NAME_PRD
        type: steps
    steps:
      - checkout
      - heroku/install
      - heroku/deploy-via-git:
          app-name: << parameters.app-name >>
      - steps: << parameters.post-deploy >>

commands:
  bundle-install:
    steps:
      - ruby-orbs/bundle-install:
          bundle_clean: true
          bundle_extra_args: ''
          bundle_gemfile: Gemfile
          bundle_jobs: 4
          bundle_path: vendor/bundle
          bundle_retry: 3
          cache_key_prefix: v1-bundle-dependencies
          restore_bundled_with: true
  preparate:
    steps:
      - checkout
      - bundle-install

dockerfile

FROM ruby:3.0.2
RUN apt-get update -qq && apt-get install -y --no-install-recommends nodejs default-mysql-client && apt-get clean && rm -rf /var/lib/apt/lists/*
RUN apt-get update && apt-get install -y curl apt-transport-https wget && \
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
apt-get update && apt-get install -y yarn
RUN curl -sL https://deb.nodesource.com/setup_14.x | bash - && \
apt-get install -y nodejs
RUN mkdir /okonomiyakidb
WORKDIR /okonomiyakidb
COPY Gemfile /okonomiyakidb/Gemfile
COPY Gemfile.lock /okonomiyakidb/Gemfile.lock
RUN bundle install
RUN rails webpacker:install
COPY . /okonomikakidb

COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

CMD ["rails", "server", "-b", "0.0.0.0"]