fix: correct the 'sed' chapter sample file #269

	name: Validate Pull Request

	# This workflow verifies that the site will build for pull requests.
	on: [pull_request]

	jobs:
	validate-pull-request:
	runs-on: ubuntu-20.04
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	# Fixup Git URLs, see:
	# https://stackoverflow.com/questions/70663523/the-unauthenticated-git-protocol-on-port-9418-is-no-longer-supported
	- name: Fix up git URLs
	run: echo -e '[url "https://github.com/"]\n insteadOf = "git://github.com/"' >> ~/.gitconfig

	# Check typescript compiles properly.
	- name: Check TypeScript
	run: make typescript-check

	# Run the build - this will fail if there are broken links etc.
	- name: Build
	run: make build

	# Store the artifacts in case we want to validate samples etc.
	- name: Store Artifacts
	uses: actions/upload-artifact@v4
	with:
	name: artifacts
	path: artifacts

	# See:
	# https://github.com/marketplace/actions/deploy-pr-preview
	deploy-preview:
	runs-on: ubuntu-20.04
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Install and Build
	if: github.event.action != 'closed' # You might want to skip the build if the PR has been closed
	run: npm install --legacy-peer-deps && npm run build

	- name: Deploy preview
	uses: rossjrw/pr-preview-action@v1
	with:
	source-dir: ./build/

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