[ci] Add also ROOT 6.30 from LCG to the test matrix

[guitargeek]

This is to test also these older ROOT versions with the more rigurous CTests that come when building Combine standalone with CMake.

Summary by CodeRabbit

Chores

• Expanded the continuous integration testing matrix by introducing additional release configurations with different compiler versions and architecture specifications to improve build compatibility verification across multiple platform combinations.
• Maintained all existing release configurations to ensure comprehensive build testing coverage while preparing infrastructure for potential future test scenario expansions.

[coderabbitai]

Walkthrough

The pull request expands the continuous integration matrix in the CVMFS CI workflow by adding two new LCG (LHC Computing Grid) configurations: LCG_102 with ROOT 6.26.04 and LCG_105 with ROOT 6.30.02, both targeting Ubuntu 22.04 with GCC 11. Existing configurations are retained, with an additional commented entry for future LCG_104 support.

Changes

Cohort / File(s)	Summary
CI Matrix Expansion \.github/workflows/cvmfs-ci\.yml	Added two new LCG release configurations (LCG_102, LCG_105) to the test matrix with corresponding ROOT versions (6.26.04, 6.30.02) and Ubuntu 22.04 GCC 11 architecture. Preserved existing LCG entries and included commented template for future LCG_104 addition.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Test ROOT 6.32 in the CI using LCG and not CMSSW #1136: Modifies the same CI workflow file by changing/adding LCG-based matrix entries with different LCG versions and configurations.
• [ci] Add ROOT 6.36.02 and master via LCG views on CVMFS #1127: Updates the same CI workflow with LCG_RELEASE/LCG_ARCH/ROOT matrix entries, representing iterative CI configuration improvements.

Poem

🐰 Hop, hop! The CI matrix grows wide,
LCG_102 and 105 now reside,
With ROOT versions new, Ubuntu clean,
The tests shall run on every scene! ✨

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The PR title "[ci] Add also ROOT 6.30 from LCG to the test matrix" accurately describes a real part of the changeset—specifically, the addition of ROOT 6.30.02 (via LCG_105) to the CI matrix. However, the actual changes include two ROOT versions: both 6.26.04 (LCG_102) and 6.30.02 (LCG_105), whereas the title only mentions 6.30. This makes the title partially related to the full scope of the PR, as it captures one of two equally important additions but omits the other.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[vgvassilev]

Looks reasonable to me.

[anigamova]

On hold for now, from 6.30 series we need >= 6.30.09, while LCG provides 6.30.02