Add Rails 8 gemfile and CI test

Author: accessd

.github/workflows/build.yml

@@ -8,6 +8,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - ruby: 3.3
+            gemfile: gemfiles/Gemfile-8-0
           - ruby: 3.1
             gemfile: gemfiles/Gemfile-7-0
           - ruby: 3.0.0

gemfiles/Gemfile-8-0

@@ -0,0 +1,7 @@
+source "https://rubygems.org"
+
+gem "rails", "~> 8.0.0"
+gem "rails-settings-cached", "2.8.2"
+gem "sqlite3", ">= 2.1"
+
+gemspec path: ".."