Test against Ruby 3.4 in CI

Author: yuki24

.github/workflows/tests.yml

@@ -1,13 +1,15 @@
 name: build
 
 on:
-  - push
+  push:
+  pull_request:
 
 jobs:
   stable:
     strategy:
       matrix:
         ruby_version:
+          - '3.4'
           - '3.3'
           - '3.2'
           - '3.1'
@@ -29,6 +31,18 @@ jobs:
           - gemfiles/rails_50.gemfile
           - gemfiles/rails_42.gemfile
         exclude:
+          - ruby_version: '3.4'
+            gemfile: gemfiles/rails_61.gemfile
+          - ruby_version: '3.4'
+            gemfile: gemfiles/rails_60.gemfile
+          - ruby_version: '3.4'
+            gemfile: gemfiles/rails_52.gemfile
+          - ruby_version: '3.4'
+            gemfile: gemfiles/rails_51.gemfile
+          - ruby_version: '3.4'
+            gemfile: gemfiles/rails_50.gemfile
+          - ruby_version: '3.4'
+            gemfile: gemfiles/rails_42.gemfile
           - ruby_version: '3.3'
             gemfile: gemfiles/rails_61.gemfile
           - ruby_version: '3.3'