Test against Rails 8.1 in CI

Author: yuki24

Appraisals

@@ -22,6 +22,12 @@ appraise "rails_80" do
   gem "railties", "~> 8.0.0"
 end
 
+appraise "rails_81" do
+  gem "activesupport", "~> 8.1.0"
+  gem "actionpack", "~> 8.1.0"
+  gem "railties", "~> 8.1.0"
+end
+
 appraise "rails_edge" do
   git 'https://github.com/rails/rails.git' do
     gem "activesupport", require: 'active_support'

gemfiles/rails_81.gemfile

@@ -0,0 +1,10 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "minitest", "< 5.25.0"
+gem "activesupport", "~> 8.1.0"
+gem "actionpack", "~> 8.1.0"
+gem "railties", "~> 8.1.0"
+
+gemspec path: "../"