Add new workflow for C++ SDK #17

	name: C++ SDK

	on:
	push:
	branches: ['main']
	paths: ['src/cc/flwr/**']
	pull_request:
	branches: ['main']
	paths: ['src/cc/flwr/**']

	jobs:
	build_and_test:
	name: Build and test
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	- name: Bootstrap
	uses: ./.github/actions/bootstrap

	- name: Cache SDK build
	uses: actions/cache@v3
	with:
	path: build/
	key: ${{ runner.os }}-sdk-build

	- name: Cache example build
	uses: actions/cache@v3
	with:
	path: examples/quickstart-cpp/build/
	key: ${{ runner.os }}-example-build

	- name: Install Dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install -y clang-format cmake g++ clang-tidy cppcheck

	- name: Check Formatting
	run: \|
	find src/cc/flwr -name '.cc' -or -name '.h' \| xargs clang-format -i
	git diff --exit-code

	- name: Build
	run: \|
	mkdir build
	cd build
	cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON ../src/cc/flwr
	make

	- name: Run clang-tidy
	run: \|
	cd build
	find ../src/cc/flwr/src -name '*.cc' \| xargs clang-tidy

	- name: Run cppcheck
	run: \|
	cd build
	cppcheck --enable=all --inline-suppr --suppress=missingIncludeSystem -I../src/cc/flwr/include ../src/cc/flwr/src

	- name: End-to-end test
	run: \|
	cd examples/quickstart-cpp
	cmake -S . -B build
	cmake --build build
	pip install ../..
	timeout 2m python server.py &
	pid=$!
	sleep 3
	build/flwr_client 0 127.0.0.1:8080 &
	sleep 3
	build/flwr_client 1 127.0.0.1:8080 &
	wait $pid
	res=$?
	if [[ "$res" = "0" ]];
	then echo "Training worked correctly";
	else echo "Training had an issue" && exit 1;
	fi

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