only allow alpha num for subdomain names

Author: Boy132

subdomains/src/Filament/Admin/Resources/Servers/RelationManagers/SubdomainRelationManager.php

@@ -111,6 +111,7 @@ public function form(Schema $schema): Schema
                     ->label(trans('subdomains::strings.name'))
                     ->required()
                     ->unique()
+                    ->alphaNum()
                     ->columnSpanFull()
                     ->suffix(fn (Get $get) => '.' . CloudflareDomain::find($get('domain_id'))?->name),
                 Select::make('domain_id')

subdomains/src/Filament/Server/Resources/Subdomains/SubdomainResource.php

@@ -143,6 +143,7 @@ public static function form(Schema $schema): Schema
                     ->label(trans('subdomains::strings.name'))
                     ->required()
                     ->unique()
+                    ->alphaNum()
                     ->columnSpanFull()
                     ->suffix(fn (Get $get) => '.' . CloudflareDomain::find($get('domain_id'))?->name),
                 Select::make('domain_id')