WIP: init debian package generation via cpack

[jfdev001]

Towards #499

Work in progress, just opening PR to show ongoing effort. Definitely not shippable yet.

Adds some basic cpack logic has been added to generate a debian package for FTorch. I have been able to successfully generate a debian package on an x86_64 Ubuntu 24.04 LTS machine. You can try out the debian package generation via the following commands:

git clone git@github.com:jfdev001/FTorch.git
cd FTorch
git checkout -b jfrazier/499-debian-package origin/jfrazier/499-debian-package
export Torch_DIR=<your path to cpu torch installation here> # gpu torch has not been tried
mkdir build
cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build
cd build 
cpack -G DEB --config CPackConfig.cmake 

You can then inspect the generated debian package with dpkg. E.g.,

dpkg -e FTorch-1.0.0-amd64.deb

outputs DEBIAN/control which contains

Architecture: amd64
Depends: libc6 (>= 2.32), libgcc-s1 (>= 3.0), libgfortran5 (>= 8), libstdc++6 (>= 5.2)
Description: Fortran interface to PyTorch models
 FTorch is a library for calling PyTorch machine learning models directly
 from Fortran code. It enables coupling TorchScript models trained in PyTorch
 to existing Fortran applications without requiring Python at runtime.
Maintainer: Jared Frazier (cscidev001@gmail.com)
Package: ftorch
Priority: optional
Section: devel
Version: 1.0.0
Installed-Size: 296

Similarly,

dpkg -c FTorch-1.0.0-amd64.deb

outputs

drwxrwxr-x root/root         0 2026-02-26 14:56 ./usr/include/
-rw-r--r-- root/root     14079 2026-02-26 11:15 ./usr/include/ctorch.h
drwxrwxr-x root/root         0 2026-02-26 14:56 ./usr/include/ftorch/
-rw-r--r-- root/root     10342 2026-02-26 14:56 ./usr/include/ftorch/ftorch.mod
-rw-r--r-- root/root       393 2026-02-26 14:56 ./usr/include/ftorch/ftorch_devices.mod
-rw-r--r-- root/root      3404 2026-02-26 14:56 ./usr/include/ftorch/ftorch_model.mod
-rw-r--r-- root/root     10593 2026-02-26 14:56 ./usr/include/ftorch/ftorch_tensor.mod
-rw-r--r-- root/root      2037 2026-02-26 14:56 ./usr/include/ftorch/ftorch_test_utils.mod
-rw-r--r-- root/root       454 2026-02-26 14:56 ./usr/include/ftorch/ftorch_types.mod
drwxrwxr-x root/root         0 2026-02-26 14:56 ./usr/lib/
drwxrwxr-x root/root         0 2026-02-26 14:56 ./usr/lib/cmake/
drwxrwxr-x root/root         0 2026-02-26 14:56 ./usr/lib/cmake/FTorch/
-rw-r--r-- root/root      1255 2026-02-26 14:56 ./usr/lib/cmake/FTorch/FTorchConfig.cmake
-rw-r--r-- root/root       888 2026-02-26 14:56 ./usr/lib/cmake/FTorch/FTorchTargets-release.cmake
-rw-r--r-- root/root      4074 2026-02-26 14:56 ./usr/lib/cmake/FTorch/FTorchTargets.cmake
-rw-r--r-- root/root    226560 2026-02-26 14:56 ./usr/lib/libftorch.so
drwxrwxr-x root/root         0 2026-02-26 14:56 ./usr/lib/pkgconfig/
-rw-r--r-- root/root       321 2026-02-26 14:56 ./usr/lib/pkgconfig/ftorch.pc

TODO:

• Test debian package (currently built with CPU torch version only)
• Update CI to add some lightweight smoke test for the generated debian package
• More modular logic for desired architecture (e.g., only amd64 is explicitly supported at the moment)
• Add logic for RPM package generation
• Update CI that automatically builds the .deb/.rpm packages to be pushed to releases when releasing a new version of FTorch (see e.g., https://github.com/aaddrick/claude-desktop-debian/blob/4093324f0691e8789f6ab45acd2027394e8d5ff2/.github/workflows/ci.yml#L76-L82 and replace https://github.com/aaddrick/claude-desktop-debian/blob/4093324f0691e8789f6ab45acd2027394e8d5ff2/.github/workflows/build-amd64.yml#L44-L61 with calls to cpack)