[MINOR]: Adding guideline #4

	name: Deploy PR Preview

	on:
	pull_request_target:
	types:
	- opened
	- reopened
	- synchronize
	- closed
	paths:
	- 'docs/**'

	permissions:
	contents: write
	pull-requests: write
	issues: write

	jobs:
	deploy-preview:
	runs-on: ubuntu-latest
	defaults:
	run:
	working-directory: docs
	steps:
	- uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.sha }}

	- uses: actions/setup-node@v4
	with:
	node-version: 20
	cache: npm
	cache-dependency-path: docs/package-lock.json

	- name: Install dependencies
	run: npm ci

	- name: Deploy preview
	uses: rossjrw/pr-preview-action@v1
	with:
	source_dir: docs/build
	preview_branch: gh-pages
	umbrella_dir: pr-preview
	action: auto
	# We need to build the site within the action context or before
	# rossjrw action can run a build command, but it's often easier to run the build ourselves
	# provided we can set the env var.
	# Actually, the action supports a 'build_script' input.
	build_script: npm run build
	# We need to pass the BASE_URL env var to the build script.
	# The action doesn't natively expose a way to inject env vars into the build_script
	# easily unless we wrap it or use the 'env' map at the step level.
	env:
	# The action calculates the preview URL. We need to construct the matching Base URL.
	# Default format is: /<umbrella_dir>/<pr_number>/
	# But we are deployed at /OpenGIN/. So it will be /OpenGIN/pr-preview/<pr_number>/
	BASE_URL: /OpenGIN/pr-preview/${{ github.event.number }}/

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