Update index.md #19

	name: Deploy
	on:
	push:
	branches:
	master

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	with:
	persist-credentials: false

	# https://github.com/actions/cache/blob/master/examples.md#ruby---bundler
	- name: "Cache: Set up bundler cache"
	uses: actions/cache@v2
	with:
	path: vendor/bundle
	key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
	restore-keys: \|
	${{ runner.os }}-gems-
	- name: Use Node.js
	uses: actions/setup-node@v1
	with: { node-version: '12.x' }

	- name: Use Ruby
	uses: ruby/setup-ruby@v1
	with: { ruby-version: '2.7' }

	- name: Setup dependencies
	run: \|
	npm i
	bundle config path vendor/bundle
	bundle install --jobs 4 --retry 3
	- run: npm run build && bundle exec jekyll build

	- name: 🚀 deploy
	uses: peaceiris/actions-gh-pages@v3
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: ./_site

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