The database connection error occurs when running the docker command for the first time(初めてDockerコマンドを実行するときにDB接続エラーが発生する)

[Shunsuke2967]

• Cause of error(エラーの原因)
  • The database is not yet ready to connect when it is trying to do so(データベースが接続しようとする時にまだその準備できていない)
• output at runtime (実行時の出力)

  
  $ docker compose run backend rails db:create
  [+] Creating 2/0
  ✔ Network progaku-archive_default  Created                                                                                                                                                                                                         0.0s 
  ✔ Container pa_database            Created                                                                                                                                                                                                         0.1s 
  [+] Running 1/1
  ✔ Container pa_database  Started                                                                                                                                                                                                                   0.1s 
  Can't connect to server on 'db' (115)
  Couldn't create 'app_development' database. Please check your configuration.
  rails aborted!
  ActiveRecord::ConnectionNotEstablished: Can't connect to server on 'db' (115)

Caused by: Mysql2::Error::ConnectionError: Can't connect to server on 'db' (115)