Test with Ruby 4.0 on CI

ankane · ankane · commit 00af4272c8de · 2025-12-28T07:36:16.000-08:00
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -7,6 +7,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - ruby: "4.0"
+            os: ubuntu-24.04
           - ruby: 3.4
             os: ubuntu-24.04
           - ruby: 3.3
