Only use .env.local.php in the prod environment

This prevents surprises when you have generated the file, and then run your tests.

Author: mcfedr

symfony/framework-bundle/3.3/config/bootstrap.php

@@ -6,7 +6,7 @@
 
 // Load cached env vars if the .env.local.php file exists
 // Run "composer dump-env prod" to create it (requires symfony/flex >=1.2)
-if (is_array($env = @include dirname(__DIR__).'/.env.local.php')) {
+if ('prod' === ($_SERVER['APP_ENV'] ?? $_ENV['APP_ENV'] ?? 'prod') && is_array($env = @include dirname(__DIR__).'/.env.local.php')) {
     foreach ($env as $k => $v) {
         $_ENV[$k] = $_ENV[$k] ?? (isset($_SERVER[$k]) && 0 !== strpos($k, 'HTTP_') ? $_SERVER[$k] : $v);
     }