Describe the bug

Stirling-PDF does not support OCR out of the box. While checkboxes for various languages are displayed, an internal server error prompts failure upon execution. Looking into the configuration, the Tessdata (datasets for OCR) seems to be expected to be in /usr/share/tessdata.

Steps To Reproduce

Steps to reproduce the behavior:

1. Install Stirling-PDF with services.stirling-pdf.enable = true;
2. Go to http://localhost:8080/ocr-pdf
3. Check any box
4. Press the button Process PDF with OCR

Expected behavior

Installations using Docker worked without any problems, after Tessdata has been installed. However, this is a manual process. I would expect this package to be bundled with the data by default or expose an additional flag for activation.

Screenshots

Metadata

~ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.6.67, NixOS, 24.11 (Vicuna), 24.11.711815.1807c2b91223`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.24.10`
 - channels(root): `"home-manager-24.11.tar.gz, nixos-24.11, nixos-hardware, nixos-unstable"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

Notify maintainers

@TomaSajt

Note for maintainers: Please tag this issue in your PR.

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