Install libxml2/libxslt dev packages to fix lxml build on Python 3.14

[Copilot]

The CI fails when pip builds lxml from source on Python 3.14 (no prebuilt wheels available yet) due to missing system libraries.

Changes

• Add workflow step to install libxml2-dev and libxslt1-dev before pip install in .github/workflows/build-website-reusable.yml

- name: Install system dependencies for lxml
  run: |
    sudo apt-get update
    sudo apt-get install -y libxml2-dev libxslt1-dev

This ensures lxml can build from source when wheels aren't available for newer Python versions.

Original prompt

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This section details on the original issue you should resolve

<issue_title>CI: pip install fails building lxml on Python 3.14 — missing libxml2/libxslt dev packages</issue_title>
<issue_description>Failing job: https://github.com/OWASP/mas-website/actions/runs/19177110806/job/54824627154

Summary

The GitHub Actions job fails during pip install when building lxml. The installer errors with:
"Error: Please make sure the libxml2 and libxslt development packages are installed."

Relevant workflow file

.github/workflows/monitor-repos-and-deploy.yml at ref 2080af4
https://github.com/OWASP/mas-website/blob/2080af424b3d996ac79add169bc3a537cf59f884/.github/workflows/monitor-repos-and-deploy.yml

Log excerpt

Getting requirements to build wheel: finished with status 'error'
error: subprocess-exited-with-error
× Getting requirements to build wheel did not run successfully.
Error: Please make sure the libxml2 and libxslt development packages are installed.
[...]
A new release of pip is available: 25.2 -> 25.3

Cause

The runner is missing system development headers/libraries required to compile lxml from source (libxml2-dev and libxslt1-dev). On newer Python versions (3.14) prebuilt lxml wheels may not be available on PyPI yet, so pip falls back to building from source.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes CI: pip install fails building lxml on Python 3.14 — missing libxml2/libxslt dev packages #32

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