Add code coverage job with Codecov upload and workflow_dispatch trigger

[facontidavide]

• Add workflow_dispatch trigger to enable manual runs via gh workflow run
• Add separate coverage job that builds in Debug mode with --coverage flags
• Use lcov to collect and filter coverage data (excludes 3rdparty, tests, examples)
• Upload coverage.info to Codecov using CODECOV_TOKEN secret
• Keep existing Release build job unchanged

Summary by CodeRabbit

• Chores
  • Enhanced CI/CD workflow with manual dispatch capability.
  • Introduced automated code coverage collection and reporting to Codecov.
  • Streamlined workflow configuration by removing legacy comments.

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[coderabbitai]

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📝 Walkthrough

Walkthrough

The workflow file was enhanced with manual dispatch triggering capability, legacy comments removed, and a new coverage job added to compile with coverage instrumentation, execute tests, collect coverage metrics via lcov, and report results to Codecov.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow Configuration .github/workflows/cmake_ubuntu.yml	Added workflow_dispatch trigger for manual workflow invocation, removed legacy comments, and introduced a new coverage job that builds with coverage flags, runs tests, collects lcov metrics, and uploads coverage data to Codecov.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A workflow takes flight with a tap and a touch,
Coverage flags bloom, collecting just much,
Codecov receives the metrics so bright,
Our tests now glow with quality light! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely summarizes the main changes: adding a code coverage job with Codecov upload and a workflow_dispatch trigger.
Description check	✅ Passed	The description covers the key changes with specific implementation details, though it doesn't address the template's guidance on comments, API changes, or testing.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/codecov-ci

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[Copilot]

Pull request overview

This PR enhances the Ubuntu CMake GitHub Actions workflow by adding a manually-triggerable run and a dedicated coverage job that collects and uploads code coverage to Codecov.

Changes:

• Added a workflow_dispatch trigger to allow manual runs of the Ubuntu CMake workflow.
• Introduced a new coverage job that configures a Debug build with --coverage flags, runs tests, and collects coverage with lcov while excluding third-party, test, and example directories.
• Configured automatic upload of the generated coverage.info report to Codecov using the Codecov GitHub Action.

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[codecov]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered ☂️