test(notifications): add e2e tests #3910

	# github actions: https://docs.github.com/en/actions/use-cases-and-examples/building-and-testing/building-and-testing-nodejs
	# setup-node: https://github.com/actions/setup-node

	name: Notifications

	on:
	# `pull_request_target` (as opposed to `pull_request`) gives permissions to comment on PRs.
	pull_request_target:
	branches: [master, feature/*, staging]
	# Default = opened + synchronize + reopened.
	# We also want "edited" so that changelog notifications runs when PR title is updated.
	# https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#pull_request
	types:
	- edited
	- opened
	- reopened
	- synchronize

	# Cancel old jobs when a pull request is updated.
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	notify:
	if: github.repository == 'aws/aws-toolkit-vscode'
	runs-on: ubuntu-latest
	permissions:
	pull-requests: write
	issues: read
	steps:
	- uses: actions/checkout@v4
	if: github.event_name == 'pull_request_target'
	with:
	fetch-depth: 20
	- uses: actions/setup-node@v4
	if: github.event_name == 'pull_request_target'
	with:
	node-version: '20'
	- name: Comment about contribution guidelines
	uses: actions/github-script@v7
	if: github.event_name == 'pull_request_target'
	with:
	script: \|
	const notify = require('.github/workflows/notify.js')
	await notify({github, context})

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