refactors to use a Plugin to parse --ci option

src/Plugins/Context.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Plugins;
+
+use Pest\Contracts\Plugins\HandlesArguments;
+
+/**
+ * @internal
+ */
+final class Context implements HandlesArguments
+{
+    public const ENV_CI    = 'ci';
+    public const ENV_LOCAL = 'local';
+
+    /**
+     * @var \Pest\Plugins\Context
+     */
+    private static $instance;
+
+    /**
+     * @var string
+     */
+    public $env = 'local';
+
+    public static function getInstance(): Context
+    {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+
+        return self::$instance;
+    }
+
+    public function handleArguments(array $arguments): array
+    {
+        foreach ($arguments as $index => $argument) {
+            if ($argument === '--ci') {
+                unset($arguments[$index]);
+                self::getInstance()->env = 'ci';
+            }
+        }
+
+        return array_values($arguments);
+    }
+}