Eager load routes if necessary

Author: andyw8

lib/ruby_lsp/ruby_lsp_rails/server.rb

@@ -6,6 +6,10 @@
 # NOTE: We should avoid printing to stderr since it causes problems. We never read the standard error pipe from the
 # client, so it will become full and eventually hang or crash. Instead, return a response with an `error` key.
 
+# Load routes if they haven't been loaded yet (see https://github.com/rails/rails/pull/51614).
+routes_reloader = Rails.application.routes_reloader
+routes_reloader.execute_unless_loaded if routes_reloader&.respond_to?(:execute_unless_loaded)
+
 module RubyLsp
   module Rails
     class Server