Fix return value not actually being returned #382

	name: Linux Build & Unit Tests
	on: [push]

	jobs:
	build:
	name: ubuntu-build
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	submodules: recursive

	- name: install wxwidgets
	run: \|
	export DISPLAY=:0.0
	sudo apt install xvfb cmake libtbb-dev libgtk-3-0 libgtk-3-dev
	git clone https://github.com/wxWidgets/wxWidgets.git --recurse-submodules
	cd wxWidgets
	mkdir buildgtk
	cd buildgtk
	../configure --with-gtk
	make -j4
	sudo make install
	sudo ldconfig
	cd ..
	cd ..
	cmake ./
	make -j4

	- name: build
	run: \|
	cd ..
	cd Wisteria-Dataviz
	cmake ./
	make -j4

	- name: run tests
	run: \|
	cd ..
	git clone https://github.com/catchorg/Catch2.git
	cd Wisteria-Dataviz/tests
	cmake ./
	make -j4
	cd bin
	./WisteriaTestRunner --reporter JUnit::out=WDV-junit.xml
	cat WDV-junit.xml
	errors=$(cat WDV-junit.xml \| grep -Po '(errors)="\K[^"]*')
	failures=$(cat WDV-junit.xml \| grep -Po '(failures)="\K[^"]*')
	echo "Error count is: ${errors}"
	echo "Failure count is: ${failures}"
	if [ "$errors" -gt 0 ]; then
	exit 1
	fi
	if [ "$failures" -gt 0 ]; then
	exit 1
	fi

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