ci: use GitHub-hosted ubuntu-latest runners

[GeiserX]

Summary

Switches self-hosted Linux CI jobs to GitHub-hosted ubuntu-latest.

Why

GitHub-hosted standard runners are free and unlimited on public repos. Moving CI off the home-lab self-hosted runners:

• frees my servers from CI load,
• runs PR code in throwaway isolated VMs (removes the fork-PR attack surface entirely),
• costs $0 on public repos.

The earlier self-hosted fork-guard if: is removed (no longer needed on hosted runners). Any macOS/Windows self-hosted jobs (desktop builds) are left unchanged.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a2ed0be5-2d67-4ce2-8120-7fac806bd2d0

📥 Commits

Reviewing files that changed from the base of the PR and between 51218b1 and 423f22c.

📒 Files selected for processing (4)

• .github/workflows/docker-publish.yml
• .github/workflows/dockerhub-description.yml
• .github/workflows/stale.yml
• .github/workflows/tests.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/use-github-hosted-runners

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