Restrict removing owner from organization

app/Exceptions/Api/CanNotRemoveOwnerFromOrganization.php

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Exceptions\Api;
+
+class CanNotRemoveOwnerFromOrganization extends ApiException
+{
+    public const string KEY = 'can_not_remove_owner_from_organization';
+}

app/Http/Controllers/Api/V1/MemberController.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\Http\Controllers\Api\V1;
 
 use App\Enums\Role;
+use App\Exceptions\Api\CanNotRemoveOwnerFromOrganization;
 use App\Exceptions\Api\EntityStillInUseApiException;
 use App\Exceptions\Api\UserNotPlaceholderApiException;
 use App\Http\Requests\V1\Member\MemberIndexRequest;
@@ -72,7 +73,7 @@ class MemberController extends Controller
     /**
      * Remove a member of the organization.
      *
-     * @throws AuthorizationException|EntityStillInUseApiException
+     * @throws AuthorizationException|EntityStillInUseApiException|CanNotRemoveOwnerFromOrganization
      *
      * @operationId removeMember
      */
@@ -86,6 +87,9 @@ class MemberController extends Controller
         if (ProjectMember::query()->whereBelongsToOrganization($organization)->where('user_id', $member->user_id)->exists()) {
             throw new EntityStillInUseApiException('member', 'project_member');
         }
+        if ($member->role === Role::Owner->value) {
+            throw new CanNotRemoveOwnerFromOrganization();
+        }
 
         $member->delete();