Update src/qibolab/backends.py #1476

	# Test Qibolab C API
	name: C API

	on:
	push:
	workflow_dispatch:

	jobs:
	tests:
	strategy:
	matrix:
	os: [ubuntu-latest]
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: "3.10"
	- name: Prepare virtual environment
	run: \|
	python -m venv env
	- name: Install dependencies
	run: \|
	# build dependencies
	pip install cffi
	# runtime dependencies
	. env/bin/activate
	pip install cffi # also a runtime dep
	pip install .
	- name: Build & install library
	working-directory: capi
	run: \|
	cmake -S . -B build -DCMAKE_INSTALL_PREFIX=$(realpath ../env)
	cmake --build build
	cmake --install build
	- name: Build & run example
	working-directory: capi/examples
	run: \|
	. ../../env/bin/activate
	export PKG_CONFIG_PATH=${VIRTUAL_ENV}/lib/pkgconfig/:${PKG_CONFIG_PATH}:
	export LD_LIBRARY_PATH=${VIRTUAL_ENV}/lib/:${LD_LIBRARY_PATH}:
	make
	./example

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