Return the last timestamp where an expert is valid #73

	name: C++ tests
	on:
	pull_request:
	jobs:
	build_cpp:
	runs-on: ubuntu-latest
	steps:
	- run: echo "The job was automatically triggered by a ${{ github.event_name }} event."
	- run: echo "This job is now running on a ${{ runner.os }} server."
	- run: echo "Running on branch ${{ github.ref }} of repository ${{ github.repository }}."
	- name: Check out repository code.
	uses: actions/checkout@v2
	- name: Install dependencies.
	run: \|
	sudo apt-get update
	sudo apt-get install libsfml-dev
	git submodule sync
	git submodule update --init --recursive
	- name: Build C++ nocturne library.
	run: \|
	cd ${{ github.workspace }}/nocturne/cpp
	mkdir build
	cd build
	cmake ..
	make
	- name: Run C++ tests.
	run: \|
	cd ${{ github.workspace }}/nocturne/cpp/build/tests
	./nocturne_test
	- run: echo "Job finished with status ${{ job.status }}."

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