Bump actions/setup-go from 2 to 4 #5

	name: Check docs build
	# This workflow runs when a PR is labeled with `docs`
	# This will check if the docs build successfully by running `npm run build`
	on:
	pull_request:
	paths:
	- './docs'

	jobs:
	check-docs-build:
	if: ${{ github.event.label.name == 'docs' }}

	name: Check docs build
	runs-on: ubuntu-latest
	steps:
	- name: Checkout 🛎️
	uses: actions/checkout@v2.4.0
	with:
	persist-credentials: false
	fetch-depth: 0

	- name: Install dependencies and build docs 🧱
	run: \|
	cd docs
	npm install
	npm run build

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