GH actions: added activemodel 8 and use ubuntu 24.04 image

.github/workflows/specs.yml

@@ -12,13 +12,13 @@ on:
 jobs:
   test:
     if: "!contains(github.event.head_commit.message, '[skip ci]')"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     env: # $BUNDLE_GEMFILE must be set at the job level, so it is set for all steps
       BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}
     strategy:
       matrix:
-        ruby-version: ['2.6', '2.7', '3.0', '3.1', '3.2', '3.3', 'jruby-9.4.7.0']
-        gemfile: [ 'standalone', 'activemodel-5', 'activemodel-6', 'activemodel-7' ]
+        ruby-version: ['2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', 'jruby-9.4.7.0']
+        gemfile: [ 'standalone', 'activemodel-5', 'activemodel-6', 'activemodel-7', 'activemodel-8' ]
         exclude:
           - ruby-version: '3.3'
             gemfile: 'activemodel-5'
@@ -32,6 +32,14 @@ jobs:
             gemfile: 'activemodel-7'
           - ruby-version: 'jruby-9.4.7.0'
             gemfile: 'activemodel-5'
+          - ruby-version: '2.6'
+            gemfile: 'activemodel-8'
+          - ruby-version: '2.7'
+            gemfile: 'activemodel-8'
+          - ruby-version: '3.0'
+            gemfile: 'activemodel-8'
+          - ruby-version: '3.1'
+            gemfile: 'activemodel-8'
 
     steps:
     - uses: actions/checkout@v4

gemfiles/activemodel-8

@@ -0,0 +1,8 @@
+source 'https://rubygems.org'
+
+gem 'activemodel', '~> 8.0'
+gem 'rake'
+gem 'rspec', '~> 3.13'
+gem 'webmock', '~> 3.24'
+
+gemspec path: '../'