docker-compose run web bundle exec rake db:createをするとmysql2 のgemがないと言われてしまう

既存アプリにdockerを導入したく以下記事を参考に進めています。
Ruby on Rails 「途中まで作ったアプリにDockerを導入したい」に挑戦してみる（MySQL / Sequel Pro)

docker-compose run web bundle exec rake db:createをすると

mysql2-0.5.3が見つからないとエラーになる問題で困っています。
原因または解決策をご存知の方はいらっしゃいませんか。

私の行った手順は以下です。
(1)bundle install
→結果

$ bundle install
Using rake 13.0.6
Using concurrent-ruby 1.1.9
Using i18n 1.8.10
Using minitest 5.14.4
Using thread_safe 0.3.6
Using tzinfo 1.2.9
Using activesupport 5.2.6
Using builder 3.2.4
Using erubi 1.10.0
Using mini_portile2 2.5.3
Using racc 1.5.2
Using nokogiri 1.11.7 (x86_64-darwin)
Using rails-dom-testing 2.0.3
Using crass 1.0.6
Using loofah 2.10.0
Using rails-html-sanitizer 1.3.0
Using actionview 5.2.6
Using rack 2.2.3
Using rack-test 1.1.0
Using actionpack 5.2.6
Using nio4r 2.5.7
Using websocket-extensions 0.1.5
Using websocket-driver 0.7.5
Using actioncable 5.2.6
Using globalid 0.4.2
Using activejob 5.2.6
Using mini_mime 1.1.0
Using mail 2.7.1
Using actionmailer 5.2.6
Using activemodel 5.2.6
Using arel 9.0.0
Using activerecord 5.2.6
Using marcel 1.0.1
Using activestorage 5.2.6
Using public_suffix 4.0.6
Using addressable 2.8.0
Using amazing_print 1.3.0
Using anbt-sql-formatter 0.1.0
Using execjs 2.8.1
Using autoprefixer-rails 10.2.5.1
Using bcrypt 3.1.16
Using bindex 0.8.1
Using msgpack 1.4.2
Using bootsnap 1.7.5
Using rb-fsevent 0.11.0
Using ffi 1.15.3
Using rb-inotify 0.10.1
Using sass-listen 4.0.0
Using sass 3.7.4
Using bootstrap-sass 3.3.7
Using bundler 1.17.2
Using byebug 11.1.3
Using regexp_parser 2.1.1
Using xpath 3.2.0
Using capybara 3.35.3
Using childprocess 3.0.0
Using coderay 1.1.3
Using coffee-script-source 1.12.2
Using coffee-script 2.4.1
Using method_source 1.0.0
Using thor 1.1.0
Using railties 5.2.6
Using coffee-rails 4.2.2
Using orm_adapter 0.5.0
Using responders 3.0.1
Using warden 1.2.9
Using devise 4.8.0
Using jbuilder 2.11.2
Using jquery-rails 4.4.0
Using jquery-ui-rails 6.0.1
Using ruby_dep 1.5.0
Using listen 3.1.5
Using mysql2 0.5.3
Using pry 0.14.1
Using pry-rails 0.3.9
Using puma 3.12.6
Using rack-proxy 0.7.0
Using sprockets 3.7.2
Using sprockets-rails 3.2.2
Using rails 5.2.6
Using rails-flog 1.6.1
Using rubyzip 2.3.2
Using sassc 2.4.0
Using tilt 2.0.10
Using sassc-rails 2.1.2
Using sass-rails 6.0.0
Using selenium-webdriver 3.142.7
Using spring 2.1.1
Using spring-watcher-listen 2.0.1
Using turbolinks-source 5.2.0
Using turbolinks 5.2.1
Using tzinfo-data 1.2021.1
Using uglifier 4.2.0
Using web-console 3.7.0
Using webdrivers 4.6.0
Using webpacker 4.3.0
Bundle complete! 25 Gemfile dependencies, 96 gems now installed.
Bundled gems are installed into `./vendor/bundle`

(2)mysql2 のgemがない？トラブルシューティング記事を参考に実行

$bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include"
$bundle install --path=vendor/bundle

→結果
(1)と同じ結果

(3)以下を実行

gem install mysql2 -v '0.5.2' --source 'https://rubygems.org/' -- --with-cppflags=-I/usr/local/opt/openssl/include --with-ldflags=-L/usr/local/opt/openssl/lib

→結果

Fetching mysql2-0.5.2.gem
Building native extensions with: '--with-cppflags=-I/usr/local/opt/openssl/include --with-ldflags=-L/usr/local/opt/openssl/lib'
This could take a while...
Successfully installed mysql2-0.5.2
Parsing documentation for mysql2-0.5.2
Installing ri documentation for mysql2-0.5.2
Done installing documentation for mysql2 after 0 seconds
1 gem installed

Dockerfile
1FROM ruby:2.6.6
2RUN apt-get update && apt-get install -y nodejs --no-install-recommends && rm -rf /var/lib/apt/lists/*
3RUN apt-get update && apt-get install -y default-mysql-client --no-install-recommends && rm -rf /var/lib/apt/lists/*
4RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
5RUN mkdir /workdir
6WORKDIR /workdir
7ADD Gemfile /workdir/Gemfile
8ADD Gemfile.lock /workdir/Gemfile.lock
9RUN bundle install
10ADD . /workdir

docker
1version: '3'
2services:
3  db:
4    image: mysql:5.7
5    environment:
6      MYSQL_DATABASE: docker_development
7      MYSQL_ROOT_PASSWORD: 'password'
8      MYSQL_USER: hoge
9      MYSQL_PASSWORD: 'password'
10    ports:
11      - "4306:3306"
12  web:
13    build:
14      context: .
15      dockerfile: Dockerfile
16    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'
17    tty: true
18    stdin_open: true
19    depends_on:
20      - db
21    ports:
22      - "3000:3000"
23    volumes:
24      - .:/workdir

database.yml
1
2default: &default
3  adapter: mysql2
4  encoding: utf8
5  pool: 5
6  host: db
7
8development:
9  <<: *default
10  username: hoge
11  password: password
12  database: docker_development
13
14production:
15  <<: *default
16  database: docker_production
17  username: docker
18  password: <%= ENV['DOCKER_DATABASE_PASSWORD'] %>