add matrix_function example #24

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build-and-test:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3

	- name: Install system dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -y openmpi-bin libopenmpi-dev libopenblas-dev liblapack-dev libgtest-dev cmake ninja-build

	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: '3.10'

	- name: Configure CMake (C++ Tests)
	run: cmake -B build -G Ninja -DVBCSR_ENABLE_TESTS=ON

	- name: Build C++ Tests
	run: cmake --build build

	- name: Run C++ Tests
	run: ctest --test-dir build --output-on-failure

	- name: Install Python dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install .[mpi]
	pip install pytest

	- name: Run Python Tests
	run: \|
	# Run tests that don't require MPI or handle it internally
	pytest tests/test_api_serial.py tests/test_scipy_adapter.py

	# Run MPI tests
	mpirun -np 2 pytest tests/test_api_mpi.py tests/test_spmm.py tests/test_vbcsr.py

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