Start testing against Ruby 4.0.0 (#2963)

This also adds a few gems which were extracted from Ruby into gems:

* `ostruct`, which we use in at least
  `spec/lib/fields/polymorphic_spec.rb`,
* `benchmark`, `tsort` which we need for Rails 6.1

https://www.ruby-lang.org/en/news/2025/12/25/ruby-4-0-0-released/

Author: nickcharlton

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.2, 3.3, 3.4]
+        ruby: [3.2, 3.3, 3.4, 4.0]
     env:
       PGHOST: localhost
       PGUSER: administrate
@@ -64,7 +64,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.1, 3.2, 3.3, 3.4]
+        ruby: [3.1, 3.2, 3.3, 3.4, 4.0]
         appraisal: [rails61, rails70, rails80, pundit21]
         include:
           - ruby: '3.0'

.ruby-version

@@ -1 +1 @@
-3.4.6
+4.0.0

Gemfile

@@ -1,20 +1,23 @@
 source "https://rubygems.org"
-ruby "3.4.6" unless ENV["CI"] && !ENV["DIFF_CHECK_APPRAISAL"]
+ruby "4.0.0" unless ENV["CI"] && !ENV["DIFF_CHECK_APPRAISAL"]
 
 gemspec
 
 gem "administrate-field-image"
+gem "benchmark"
 gem "faker"
 gem "front_matter_parser"
 gem "globalid"
 gem "image_processing"
 gem "kaminari-i18n"
+gem "ostruct"
 gem "pg"
 gem "puma"
 gem "pundit"
 gem "redcarpet"
 gem "sentry-rails"
 gem "sentry-ruby"
+gem "tsort"
 
 gem "cssbundling-rails", "~> 1.4"
 gem "jsbundling-rails", "~> 1.3"
@@ -26,7 +29,7 @@ group :development, :test do
   gem "byebug"
   gem "dotenv-rails"
   gem "factory_bot_rails"
-  gem "i18n-tasks", "1.0.15"
+  gem "i18n-tasks"
   gem "standard"
   gem "yard"
 end

Gemfile.lock

@@ -158,13 +158,14 @@ GEM
       reline
     i18n (1.14.8)
       concurrent-ruby (~> 1.0)
-    i18n-tasks (1.0.15)
+    i18n-tasks (1.1.2)
       activesupport (>= 4.0.2)
       ast (>= 2.1.0)
       erubi
-      highline (>= 2.0.0)
+      highline (>= 3.0.0)
       i18n
       parser (>= 3.2.2.1)
+      prism
       rails-i18n
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.8, >= 1.8.1)
@@ -232,6 +233,7 @@ GEM
     nokogiri (1.19.0)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
+    ostruct (0.6.3)
     parallel (1.27.0)
     parser (3.3.10.0)
       ast (~> 2.4.1)
@@ -390,7 +392,7 @@ GEM
       execjs (>= 0.3.0, < 3)
     unicode-display_width (3.2.0)
       unicode-emoji (~> 4.1)
-    unicode-emoji (4.1.0)
+    unicode-emoji (4.2.0)
     uri (1.1.1)
     useragent (0.16.11)
     webmock (3.26.1)
@@ -417,6 +419,7 @@ DEPENDENCIES
   ammeter
   appraisal
   awesome_print
+  benchmark
   byebug
   capybara
   cssbundling-rails (~> 1.4)
@@ -427,11 +430,12 @@ DEPENDENCIES
   formulaic
   front_matter_parser
   globalid
-  i18n-tasks (= 1.0.15)
+  i18n-tasks
   image_processing
   jsbundling-rails (~> 1.3)
   kaminari-i18n
   launchy
+  ostruct
   pg
   puma
   pundit
@@ -444,14 +448,15 @@ DEPENDENCIES
   sprockets-rails (~> 3.5)
   standard
   timecop
+  tsort
   uglifier
   webmock
   webrick
   xpath (= 3.2.0)
   yard
 
 RUBY VERSION
-   ruby 3.4.6p54
+   ruby 4.0.0p0
 
 BUNDLED WITH
    2.4.22

gemfiles/pundit21.gemfile

@@ -2,20 +2,23 @@
 
 source "https://rubygems.org"
 
-ruby "3.4.6"
+ruby "4.0.0"
 
 gem "administrate-field-image"
+gem "benchmark"
 gem "faker"
 gem "front_matter_parser"
 gem "globalid"
 gem "image_processing"
 gem "kaminari-i18n"
+gem "ostruct"
 gem "pg"
 gem "puma"
 gem "pundit", "~> 2.1.0"
 gem "redcarpet"
 gem "sentry-rails"
 gem "sentry-ruby"
+gem "tsort"
 gem "cssbundling-rails", "~> 1.4"
 gem "jsbundling-rails", "~> 1.3"
 gem "sprockets-rails", "~> 3.5"
@@ -26,7 +29,7 @@ group :development, :test do
   gem "byebug"
   gem "dotenv-rails"
   gem "factory_bot_rails"
-  gem "i18n-tasks", "1.0.15"
+  gem "i18n-tasks"
   gem "standard"
   gem "yard"
 end

gemfiles/rails60.gemfile

@@ -2,20 +2,23 @@
 
 source "https://rubygems.org"
 
-ruby "3.4.6"
+ruby "4.0.0"
 
 gem "administrate-field-image"
+gem "benchmark"
 gem "faker"
 gem "front_matter_parser"
 gem "globalid"
 gem "image_processing"
 gem "kaminari-i18n"
+gem "ostruct"
 gem "pg"
 gem "puma"
 gem "pundit"
 gem "redcarpet"
 gem "sentry-rails"
 gem "sentry-ruby"
+gem "tsort"
 gem "cssbundling-rails", "~> 1.4"
 gem "jsbundling-rails", "~> 1.3"
 gem "sprockets-rails", "~> 3.4"
@@ -30,7 +33,7 @@ group :development, :test do
   gem "byebug"
   gem "dotenv-rails"
   gem "factory_bot_rails"
-  gem "i18n-tasks", "1.0.15"
+  gem "i18n-tasks"
   gem "standard"
   gem "yard"
 end

gemfiles/rails61.gemfile

@@ -2,20 +2,23 @@
 
 source "https://rubygems.org"
 
-ruby "3.4.6"
+ruby "4.0.0"
 
 gem "administrate-field-image"
+gem "benchmark"
 gem "faker"
 gem "front_matter_parser"
 gem "globalid"
 gem "image_processing"
 gem "kaminari-i18n"
+gem "ostruct"
 gem "pg"
 gem "puma"
 gem "pundit"
 gem "redcarpet"
 gem "sentry-rails"
 gem "sentry-ruby"
+gem "tsort"
 gem "cssbundling-rails", "~> 1.4"
 gem "jsbundling-rails", "~> 1.3"
 gem "sprockets-rails", "~> 3.5"
@@ -29,7 +32,7 @@ group :development, :test do
   gem "byebug"
   gem "dotenv-rails"
   gem "factory_bot_rails"
-  gem "i18n-tasks", "1.0.15"
+  gem "i18n-tasks"
   gem "standard"
   gem "yard"
 end

gemfiles/rails70.gemfile

@@ -2,20 +2,23 @@
 
 source "https://rubygems.org"
 
-ruby "3.4.6"
+ruby "4.0.0"
 
 gem "administrate-field-image"
+gem "benchmark"
 gem "faker"
 gem "front_matter_parser"
 gem "globalid"
 gem "image_processing"
 gem "kaminari-i18n"
+gem "ostruct"
 gem "pg"
 gem "puma"
 gem "pundit"
 gem "redcarpet"
 gem "sentry-rails"
 gem "sentry-ruby"
+gem "tsort"
 gem "cssbundling-rails", "~> 1.4"
 gem "jsbundling-rails", "~> 1.3"
 gem "sprockets-rails", "~> 3.5"
@@ -27,7 +30,7 @@ group :development, :test do
   gem "byebug"
   gem "dotenv-rails"
   gem "factory_bot_rails"
-  gem "i18n-tasks", "1.0.15"
+  gem "i18n-tasks"
   gem "standard"
   gem "yard"
 end

gemfiles/rails80.gemfile

@@ -2,20 +2,23 @@
 
 source "https://rubygems.org"
 
-ruby "3.4.6"
+ruby "4.0.0"
 
 gem "administrate-field-image"
+gem "benchmark"
 gem "faker"
 gem "front_matter_parser"
 gem "globalid"
 gem "image_processing"
 gem "kaminari-i18n"
+gem "ostruct"
 gem "pg"
 gem "puma"
 gem "pundit"
 gem "redcarpet"
 gem "sentry-rails"
 gem "sentry-ruby"
+gem "tsort"
 gem "cssbundling-rails", "~> 1.4"
 gem "jsbundling-rails", "~> 1.3"
 gem "sprockets-rails", "~> 3.5"
@@ -27,7 +30,7 @@ group :development, :test do
   gem "byebug"
   gem "dotenv-rails"
   gem "factory_bot_rails"
-  gem "i18n-tasks", "1.0.15"
+  gem "i18n-tasks"
   gem "standard"
   gem "yard"
 end