Update _index.md #2367

	name: preview-env-setup-update

	on:
	pull_request:
	types: [assigned, opened, reopened, synchronize]

	jobs:
	deploy:
	runs-on: ubuntu-latest
	if: github.event.pull_request.head.repo.full_name == github.repository
	steps:
	- uses: actions/checkout@v2
	with:
	submodules: true
	fetch-depth: 0

	- name: Setup Hugo
	uses: peaceiris/actions-hugo@v2
	with:
	hugo-version: 0.101.0
	extended: true

	- name: Build Previews
	run: \|
	rm -rf ./dist
	make plugin-data
	hugo -F -s site --baseURL http://mattermost-dev-docs-preview-pulls.s3-website-us-east-1.amazonaws.com/${{ github.event.number }}/ --destination ../dist/html

	- name: Run tests
	run: make test

	- uses: shallwefootball/s3-upload-action@master
	name: Upload Preview Env
	with:
	aws_key_id: ${{ secrets.AWS_KEY_ID }}
	aws_secret_access_key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
	aws_bucket: ${{ secrets.AWS_BUCKET }}
	source_dir: ./dist/html
	destination_dir: ${{ github.event.number }}

	- name: Add comment to PR
	uses: peter-evans/create-or-update-comment@v1
	with:
	token: ${{ secrets.GITHUB_TOKEN }}
	issue-number: ${{ github.event.number }}
	body: \|
	Newest code from ${{ github.actor }} has been published to [preview environment](http://mattermost-dev-docs-preview-pulls.s3-website-us-east-1.amazonaws.com/${{ github.event.number }}) for Git SHA ${{ github.event.pull_request.head.sha }}

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