Move application.yml check to config initializer

config/application.rb

@@ -1,18 +1,5 @@
 require_relative "boot"
 
-# Guard against deployments with old-style application.yml configurations
-# Otherwise, admins might not be aware that they are now silently ignored
-# and major problems could occur
-# rubocop:disable Rails/Output, Rails/Exit
-if File.exist?(File.expand_path("application.yml", __dir__))
-  puts "The config/application.yml file is no longer supported"
-  puts "Default settings are now found in config/settings.yml and you can override these in config/settings.local.yml"
-  puts "To prevent unexpected behaviour, please copy any custom settings to config/settings.local.yml"
-  puts " and then remove your config/application.yml file."
-  exit!
-end
-# rubocop:enable Rails/Output, Rails/Exit
-
 if ENV["OPENSTREETMAP_STATUS"] == "database_offline"
   require "active_model/railtie"
   require "active_job/railtie"

config/initializers/config.rb

@@ -1,3 +1,20 @@
+# Guard against deployments with old-style application.yml configurations
+# Otherwise, admins might not be aware that they are now silently ignored
+# and major problems could occur
+# rubocop:disable Rails/Output, Rails/Exit
+if File.exist?(Rails.root.join("config", "application.yml"))
+  puts "The config/application.yml file is no longer supported."
+  puts ""
+  puts "Default settings are now found in config/settings.yml and you"
+  puts "can override these in config/settings.local.yml."
+  puts ""
+  puts "To prevent unexpected behaviour, please copy any custom"
+  puts "settings to config/settings.local.yml and then remove"
+  puts "your config/application.yml file."
+  exit!
+end
+# rubocop:enable Rails/Output, Rails/Exit
+
 # Allowed status values
 ALLOWED_STATUS ||= [
   "online",            # online and operating normally