add the sw_webpush.js along with its git history #399

	name: Test and build
	on:
	push:
	branches:
	- master
	- develop
	pull_request:
	branches:
	- master
	- develop
	types: [opened, synchronize, reopened]
	jobs:
	build:
	runs-on: macos-latest
	steps:
	- uses: actions/checkout@v2
	- name: Use node.js version 10.x
	uses: actions/setup-node@v2.1.2
	with:
	node-version: '10.x'
	- name: Get yarn cache directory path
	id: yarn-cache-dir-path
	run: echo "::set-output name=dir::$(yarn cache dir)"
	- uses: actions/cache@v2
	id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
	with:
	path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
	key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
	restore-keys: \|
	${{ runner.os }}-yarn-
	- name: Install packages
	run: yarn
	- name: Run unit tests
	run: yarn run test:coverage
	- name: Build package
	run: yarn run build

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