Fix pdf2any Docker workflow dependency resolution

[Copilot]

The pdf2any-docker Actions job was failing before test execution because the container install step still referenced libgl1-mesa-glx, which is no longer available in the current python:3.10 image. Once that was unblocked, the job also surfaced a missing declared dependency for PIL.

• CI package update

  • Replace libgl1-mesa-glx with libgl1 in the workflow system dependency install steps.
  • Keep the Docker and Ubuntu jobs aligned on the same OpenGL runtime package.

• Runtime dependency declaration

  • Add Pillow to requirements.txt to match the existing from PIL import Image as PILImage import path used by the package.

• Net effect

  • The Docker job can progress past OS package installation and resolve the image-handling dependency required by the conversion code path.

- run: apt-get update && apt-get install -y libgl1

opencv-python>=4.5
Pillow>=12.3.0
fire>=0.3.0

[Copilot]

Pull request overview

This PR fixes CI failures in the pdf2any-docker GitHub Actions job by updating the OS package installed in the container and by declaring a missing runtime dependency needed for image processing paths in pdf2any.

Changes:

• Update CI system dependency installation to use libgl1 instead of libgl1-mesa-glx (Docker + Ubuntu jobs).
• Add Pillow to requirements.txt to satisfy the existing from PIL import Image as PILImage import used by the image conversion code.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
requirements.txt	Declares Pillow as a runtime dependency to support existing PIL-based image handling.
.github/workflows/test.yml	Updates apt package installation to libgl1 so the Docker job can install OpenGL runtime deps successfully.

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