Use current defined env in dump-env (#4099)

Author: alexander-schranz

recipe/symfony.php

@@ -66,7 +66,7 @@
 desc('Optimize environment variables');
 task('deploy:dump-env', function () {
     within('{{release_or_current_path}}', function () {
-        run('{{bin/composer}} dump-env "${APP_ENV:-prod}"');
+        run('{{bin/composer}} dump-env');
     });
 });