Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows #849

	---
	name: Compile C++

	# yamllint disable-line rule:truthy
	on:
	pull_request:
	paths-ignore:
	- '**.md'
	push:
	paths-ignore:
	- '**.md'

	jobs:

	FileList:
	outputs:
	filelist: ${{ steps.get-files.outputs.filelist }}
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set output with list of files
	id: get-files
	run: \|
	import glob, json, os
	files = glob.glob("*/tests/.cpp")
	print("::set-output name=filelist::{}".format(json.dumps(files)))
	shell: python
	- name: Display output
	run: echo ${{ steps.get-files.outputs.filelist }}

	Compile:
	runs-on: ubuntu-latest
	needs: [FileList]
	strategy:
	matrix:
	file: ${{ fromJson(needs.FileList.outputs.filelist) }}
	steps:
	- uses: actions/checkout@v2
	- name: Install Emscripten toolchain
	uses: mymindstorm/setup-emsdk@v11
	- name: Install CPP compiler
	uses: rlalik/[email protected]
	with:
	compiler: gcc-latest
	- name: Compile ${{ matrix.file }} via emcc
	run: emcc "${{ matrix.file }}"
	- name: Compile ${{ matrix.file }} via g++
	run: g++ -c "${{ matrix.file }}"

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