Ask for registry if package:login called without arguments

.gitignore

@@ -1,2 +1 @@
 /vendor/
-/*.zip

src/Command/PackageLoginCommand.php

@@ -31,7 +31,7 @@ class PackageLoginCommand extends BaseCommand
 
         $io = new SymfonyStyle($input, $output);
 
-        $server = $input->getArgument("server");
+        $server = $input->getArgument("server") ?? $io->ask("Registry (eg. 'gitea:my.domain.tld')");
         $user = $io->ask("Username");
         $token = $io->ask("Token");