Add endpoints required to store the results of a backup

app/Http/Requests/Api/Remote/ReportBackupCompleteRequest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Pterodactyl\Http\Requests\Api\Remote;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class ReportBackupCompleteRequest extends FormRequest
+{
+    /**
+     * @return string[]
+     */
+    public function rules()
+    {
+        return [
+            'successful' => 'boolean',
+            'sha256_hash' => 'string|required_if:successful,true',
+            'file_size' => 'numeric|required_if:successful,true',
+        ];
+    }
+}