FIX: hardcoded require for evals (#1137)

The require for `discourse/config/environment` should point to the local user's core Discourse environment instead of the hardcoded path for Sam's env.

Author: keegangeorge

evals/lib/boot.rb

@@ -24,12 +24,12 @@
   end
 end
 
-discourse_path = File.expand_path(File.join(__dir__, "../../../.."))
+discourse_path = ENV["DISCOURSE_PATH"] || File.expand_path(File.join(__dir__, "../../../.."))
 # rubocop:disable Discourse/NoChdir
 Dir.chdir(discourse_path)
 # rubocop:enable Discourse/NoChdir
 
-require "/home/sam/Source/discourse/config/environment"
+require "#{discourse_path}/config/environment"
 
 ENV["DISCOURSE_AI_NO_DEBUG"] = "1"
 module DiscourseAi::Evals