doc: Add relay basics #252

	name: Pull request

	on: pull_request

	jobs:
	build:
	name: Build docs
	runs-on: ubuntu-20.04
	steps:
	- name: Check out code
	uses: actions/checkout@v3
	- name: Set up Go
	uses: actions/setup-go@v3
	with:
	go-version: '~1.17'
	- name: Get Go module cache directory path
	id: go-module-cache-dir-path
	run: echo "dir=$(go env GOMODCACHE)" >> $GITHUB_OUTPUT
	- name: Initialize Go module cache
	uses: actions/cache@v3
	with:
	path: ${{ steps.go-module-cache-dir-path.outputs.dir }}
	key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
	restore-keys: \|
	${{ runner.os }}-go-
	- name: Download Go dependencies
	run: make go.deps
	- name: Set up Node
	uses: actions/setup-node@v3
	with:
	node-version: '~16'
	- name: Get Yarn cache directory path
	id: yarn-cache-dir-path
	run: echo "dir=$(npx yarn cache dir)" >> $GITHUB_OUTPUT
	- name: Initialize Yarn module cache
	uses: actions/cache@v3
	with:
	path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
	key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
	restore-keys: \|
	${{ runner.os }}-yarn-
	- name: Download Yarn dependencies
	run: make js.deps
	- name: Initialize Hugo binary cache
	id: cache-hugo
	uses: actions/cache@v3
	with:
	path: hugo.linux
	key: ${{ runner.os }}-hugo-${{ hashFiles('**/go.sum') }}
	restore-keys: \|
	${{ runner.os }}-hugo-
	- name: Build Hugo binary
	if: steps.cache-hugo.outputs.cache-hit != 'true'
	run: make hugo.linux
	- name: Build docs
	run: make build.public
	env:
	HUGO: ./hugo.linux
	HUGO_BASE_URL: https://www.thethingsnetwork.org/docs

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