Add documentation explaining some architectural concepts #4601

	name: Validate PRs

	on:
	workflow_dispatch:
	push:
	branches:
	- master
	- releases/*
	pull_request:
	branches:
	- master
	- releases/*
	- features/*

	jobs:
	build_linux:
	runs-on: ubuntu-latest
	env:
	PLAYWRIGHT_BROWSERS_PATH: 0

	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0

	- name: Cache multiple paths
	uses: actions/cache@v2
	env:
	cache-name: cache-node-modules
	with:
	path: ~/.npm
	key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
	restore-keys: \|
	${{ runner.os }}-build-${{ env.cache-name }}-
	${{ runner.os }}-build-
	${{ runner.os }}-

	- name: Install package dependencies
	run: npm ci

	- name: Check for the presence of changed files inside ./change
	run: npm run checkchange

	- name: Testing Prettier format
	run: npm run format:check

	- name: Build workspaces
	run: npm run build

	- name: Install playwright dependencies and browsers
	run: \|
	npx playwright install

	- name: Testing unit tests
	run: npm run test

	- name: Testing final validation
	run: npm run test:validation

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