Test on aarch64 Ubuntu

Author: byroot

.github/workflows/ci.yml

@@ -20,12 +20,14 @@ jobs:
       fail-fast: false
       matrix:
         os:
-        - ubuntu-22.04
+        - ubuntu-latest
         - macos-13
         - macos-14
         - windows-latest
         ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
+        arch: amd64
         include:
+        - { os: ubuntu-latest, , ruby: 3.4, arch: arm64 }
         - { os: windows-latest , ruby: mswin     } # ruby/ruby windows CI
         - { os: ubuntu-latest  , ruby: jruby-9.4 } # Ruby 3.1
         - { os: macos-latest   , ruby: truffleruby-head }