Run on ubuntu also

Author: jeromekelleher

.github/workflows/wheels.yml

@@ -11,7 +11,7 @@ jobs:
     uses: tskit-dev/.github/.github/workflows/build-wheels.yml@main
     with:
       # os-list: '["macos-14", "macos-15-intel"]'
-      os-list: '["windows-2025"]'
+      os-list: '["windows-2025", "ubuntu-24.04]'
 
   publish:
     runs-on: ubuntu-24.04