bug: doctrine.dbal.default_connection is mandatory

[pierreboissinot]

In a project not using an URL in dbal configuration:

doctrine:
    dbal:
        driver: 'pdo_pgsql'
        # See https://symfony.com/doc/current/doctrine.html#configuring-the-database
        dbname: '%env(resolve:DATABASE_NAME)%'
        host: '%env(resolve:DATABASE_HOST)%'
        port: '5432'
        charset: 'utf8'
        user: '%env(resolve:DATABASE_USER)%'
        password: '%env(resolve:DATABASE_PASSWORD)%'
        server_version: '%env(resolve:DATABASE_SERVER_VERSION)%'

There is a fatal error due to this line

import-bundle/DependencyInjection/Compiler/CredentialsConfigurationPass.php

Line 21 in d62512a

$definition->replaceArgument('$url', $credentials['url']);