bug #1061 feat: Make DockerComposeConfigurator compatible with "false" string (jawira)

This PR was merged into the 2.x branch.

Discussion
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feat: Make DockerComposeConfigurator compatible with "false" string

This fixes #1060

With this MR `DockerComposeConfigurator` will recognize `"false"` string a proper boolean.

I use `filter_var` function, I think this is a good solution because it requires only a single method call to fix the issue.

With `filter_var` function:

* true, 1, "true", "yes", "1", and "on" are recognized as `true` as well.
* any other value is `false`.

Additionally this function is already used in the same method some lines below:

https://github.com/symfony/flex/blob/423c36e369361003dc31ef11c5f15fb589e52c01/src/Configurator/DockerComposeConfigurator.php#L115-L117

Commits
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2ca7843 feat: Make DockerComposeConfigurator compatible with "false" string

Author: fabpot

src/Configurator/DockerComposeConfigurator.php

@@ -101,7 +101,7 @@ public static function shouldConfigureDockerRecipe(Composer $composer, IOInterfa
         }
 
         if (null !== $dockerPreference = $composer->getPackage()->getExtra()['symfony']['docker'] ?? null) {
-            self::$configureDockerRecipes = $dockerPreference;
+            self::$configureDockerRecipes = filter_var($dockerPreference, \FILTER_VALIDATE_BOOLEAN);
 
             return self::$configureDockerRecipes;
         }