[build] Add tex-gyre build-dep

[pieleric]

The texlive-fonts-recommended has tex-gyre as a recommended
dependency. This dependency is need to build the documentation.
However, the Ubuntu build system doesn't install the recommended
dependencies (only the required ones), contrarily to the standard
behaviour of apt. So it wasn't installed, and the build failed.

=> Add this dependency explicitly.

Also adjust the CI build instruction to behave in the same way.

[Copilot]

Pull request overview

This pull request fixes a documentation build failure by explicitly adding the tex-gyre package as a build dependency. The issue occurred because Ubuntu's build system does not install recommended dependencies by default, unlike standard apt behavior, and tex-gyre is only a recommended (not required) dependency of texlive-fonts-recommended.

Changes:

• Added tex-gyre as an explicit build dependency in debian/control
• Updated the GitHub Actions workflow to use --no-install-recommends flag to match Ubuntu build system behavior

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
debian/control	Added tex-gyre as an explicit build dependency after texlive-fonts-recommended to ensure documentation can be built successfully
.github/workflows/build_debian.yml	Added --no-install-recommends flag to mk-build-deps command to mirror Ubuntu build system behavior and catch similar issues in CI

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

The pull request makes two changes to the Debian build configuration. First, the GitHub Actions build workflow for Debian is updated to invoke mk-build-deps with the --no-install-recommends flag, which prevents automatic installation of recommended packages during dependency resolution. Second, a new build dependency, tex-gyre, is added to the Build-Depends field in debian/control. These changes optimize the build environment by reducing unnecessary package installations while explicitly declaring an additional required dependency.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding tex-gyre as an explicit build dependency to fix documentation build failures.
Description check	✅ Passed	The description clearly explains why tex-gyre is needed, the root cause of the build failure, and how the changes address it across both the control file and CI configuration.
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

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