Add Node LTS dev version/update CONTRIBUTING.md #357

	name: Test

	on: [pull_request, push]

	jobs:
	build:
	name: Build & basic tests
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2

	- name: Read node version from .nvmrc
	id: nvm
	run: echo "##[set-output name=NVMRC;]$(cat .nvmrc)"

	- name: "Setup Node v${{ steps.nvm.outputs.NVMRC }}"
	uses: actions/setup-node@v2
	with:
	node-version: "${{ steps.nvm.outputs.NVMRC }}"
	cache: 'npm'

	- name: Install dependencies
	run: npm ci

	- name: Build
	run: npm run build

	- name: Functional tests (Chromium)
	run: npm run karma

	# Run linter last so other tests run even if there is a code formatting error
	- name: Lint
	run: npm run standard

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