title: Travis build fail creating database under Symfony 4
body: <p>my Travis build fails with this error</p>
  
  <blockquote>
    <p>php bin/console doctrine:database:create --env=test
            In AbstractMySQLDriver.php line 93:<br>
            An exception occurred in driver: SQLSTATE[HY000] [1045] Access denied for user 'db_user'@'localhost' (using password: YES)                              </p>
  </blockquote>
  
  <p>Here is my travis.yml</p>
  
  <pre><code># Project language
  language: php
  
  # Allows use container-based infrastructure
  sudo: false
  
  # Start mysql service
  services:
    - mysql
  
  # Cache composer packages so "composer install" is faster
  cache:
    directories:
      - $HOME/.composer/cache/files
  
  # Matrix to test in every php version
  matrix:
    # Fast finish allows to set the build as "finished" even if the "allow_failures" matrix elements are not finished yet.
    fast_finish: true
    include:
      - php: 7.3.5
      - php: hhvm
    allow_failures:
      - php: hhvm
  
  # Define an environment variable
  env:
    - SYMFONY_VERSION="4.7.*" DB=mysql
  
  # Update composer
  before-install:
    - composer self-update
  
  # Install composer dependencies,
  # Create database, schema and fixtures
  install:
    - composer install
    - php bin/console doctrine:database:create --env=test
    - php bin/console doctrine:schema:create --env=test
    - php bin/console doctrine:fixtures:load -n --env=test
  
  # Run script
  script:
    - phpunit
  
  # After a build, send email notification with the build results
  notifications:
    email: ...@.....fr          
  </code></pre>
  
  <p>Thanks for your help.                                                                    </p>