Return list of installed plugins

Gemfile

@@ -7,5 +7,3 @@ if File.exist?(File.expand_path("../../vagrant-spec", __FILE__))
 else
   gem 'vagrant-spec', git: "https://github.com/hashicorp/vagrant-spec.git", branch: :main
 end
-
-gem "pry-byebug"

plugins/commands/serve/service/plugin_service.rb

@@ -1,3 +1,5 @@
+require "vagrant/plugin/manager"
+
 require_relative 'proto/gen/ruby-server_pb'
 require_relative 'proto/gen/ruby-server_services_pb'
 
@@ -6,8 +8,8 @@ module VagrantPlugins
     module Serve
       class PluginService < Hashicorp::Vagrant::RubyVagrant::Service
         def get_plugins(req, _unused_call)
-          
-          plugins = [Hashicorp::Vagrant::Plugin.new(name: "test")]
+          ruby_plugins = Vagrant::Plugin::Manager.instance.installed_plugins
+          ruby_plugins.map { |k, v| Hashicorp::Vagrant::Plugin.new(name: k) }
           Hashicorp::Vagrant::GetPluginsResponse.new(
             plugins: plugins
           )