Move `build.yml` runners to Ubuntu 26.04 once it leaves preview
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Description
`build.yml` pins `ubuntu-24.04` and `ubuntu-24.04-arm`. As of 2026-09-02, `ubuntu-26.04` and `ubuntu-26.04-arm` exist in [actions/runner-images](https://github.com/actions/runner-images) but are marked preview, and `ubuntu-latest` still points at 24.04. Switch both legs when 26.04 loses the preview badge.
Contributor guide
Research direction
Start with build.yml and check actions/runner-images to confirm that ubuntu-26.04 and ubuntu-26.04-arm no longer carry the preview badge. Update both pinned runner entries only after that status changes, and verify that both build legs use the new images.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- github-actions
- Domain
- ci-cd
- Issue type
- Feature
- Difficulty
- 1/5
- Estimated time
- 1-3 hours
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 78/100