Add CI for Rails 7.2

Additionally, add an exclude for main since it bumped the ruby version

.github/workflows/ci.yml

@@ -7,12 +7,18 @@ jobs:
       fail-fast: false
       matrix:
         ruby: [ '2.7', '3.0', '3.1', '3.2', '3.3', 'head', 'truffleruby' ]
-        rails: [ '6.1', '7.0', '7.1', 'main' ]
+        rails: [ '6.1', '7.0', '7.1', '7.2', 'main' ]
         exclude:
+          - ruby: '2.7'
+            rails: '7.2'
+          - ruby: '3.0'
+            rails: '7.2'
           - ruby: '2.7'
             rails: 'main'
           - ruby: '3.0'
             rails: 'main'
+          - ruby: '3.1'
+            rails: 'main'
 
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/rails_${{ matrix.rails }}.gemfile

gemfiles/rails_7.2.gemfile

@@ -0,0 +1,6 @@
+source "https://rubygems.org"
+
+gem "activemodel", "~> 7.2.0"
+gem "railties", "~> 7.2.0"
+
+gemspec path: "../"

test/cases/railtie_test.rb

@@ -9,14 +9,23 @@ class Application < Rails::Application; end
 
 class RailtieTest < ActiveSupport::TestCase
   include ActiveSupport::Testing::Isolation
+  # Not every Rails version introduces a new version
+  KNOWN_CACHE_FORMATS = {
+    6.1 => 6.1,
+    7.0 => 7.0,
+    7.1 => 7.1,
+    7.2 => 7.1,
+    8.0 => 7.1,
+  }
+  KNOWN_CACHE_FORMATS.default = 7.1
 
   def setup
     Rails.env = 'development'
     @app = BlogApp::Application.new
     @app.config.eager_load = false
     @app.config.logger = Logger.new(nil)
     @app.config.secret_key_base = ('x' * 30)
-    @app.config.active_support.cache_format_version = Rails::VERSION::STRING.to_f
+    @app.config.active_support.cache_format_version = KNOWN_CACHE_FORMATS[Rails::VERSION::STRING.to_f]
   end
 
   test 'GlobalID.app for Blog::Application defaults to blog' do