`DockerComposeConfigurator` do not honors `composer.json` configuration

[jawira]

Description

DockerComposeConfigurator do not honors composer.json configuration. For example, the following configuration will create docker compose files:

{
...
  "extra": {
    "symfony": {
      "docker": "false"
    }
  }
}

However follwing configurations will work as expected, they will not create nor update docker compose files:

{
...
  "extra": {
    "symfony": {
      "docker": false
    }
  }
}

{
...
  "extra": {
    "symfony": {
      "docker": "0"
    }
  }
}

How to reproduce

1. Configure your project with the following Composer command composer config extra.symfony.docker false.
2. Install a pack that updates docker compose files, for example composer require orm.
3. Docker compose files will be created/updated even if this is not desired.

Problem

So clearly the catch is that a string "false" is set with the composer config extra.symfony.docker false command, and this string is not recognized by PHP as a proper boolean (unlike "0" string in my examples). However because composer config command can only set strings! There is no way to set a proper boolean.

IMHO, Flex should be capable to recognize "false" string as a boolean since composer config is an a configuration command provided by Composer itself.

I identified this bug because I run composer config extra.symfony.docker false programatically in every project I create.

Fix

I created an MR that fixes this issue: #1061