ci: downgrade ubuntu build runner to 22.04 for GLIBC compatibility

[skevetter]

Signed-off-by: Samuel K skevetter@pm.me

Summary by CodeRabbit

• Chores
  • Updated CI/CD build and testing infrastructure to use a standardized Ubuntu 22.04 environment across all automated workflows for improved consistency and reliability.

[coderabbitai]

📝 Walkthrough

Walkthrough

Two GitHub Actions workflow files are updated to replace the generic ubuntu-latest runner label with the pinned version ubuntu-22.04 across multiple jobs. One artifact name is also updated to reflect the new runner version.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow Updates .github/workflows/pr-ci.yml, .github/workflows/release.yml	Runner environment specifications changed from ubuntu-latest to ubuntu-22.04 across CI and release jobs. Artifact name in build-flatpak job updated from desktop-ubuntu-latest-amd64 to desktop-ubuntu-22.04-amd64.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: replacing ubuntu-latest with ubuntu-22.04 across CI workflows for GLIBC compatibility, which matches the core objective of the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch downgrade-ubuntu-runner-for-glibc

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