modernize setup #1

	name: Changelog check
	on:
	pull_request:
	types: [assigned, opened, synchronize, reopened, labeled, unlabeled]
	branches:
	- main

	env:
	node-version: 18.x

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	# Fetch all history
	fetch-depth: '0'

	- name: Install pipx
	run: pip install towncrier

	# node setup
	- name: Use Node.js ${{ env.node-version }}
	uses: actions/setup-node@v3
	with:
	node-version: ${{ env.node-version }}
	cache: 'yarn'

	# node install
	- name: Install dependencies
	run: yarn

	- name: Check for presence of a Change Log fragment (only pull requests)
	run: \|
	# Fetch the pull request' base branch so towncrier will be able to
	# compare the current branch with the base branch.
	# Source: https://github.com/actions/checkout/#fetch-all-branches.
	git fetch --no-tags origin main
	towncrier check --compare-with origin/main
	env:
	BASE_BRANCH: ${{ github.base_ref }}
	if: github.event_name == 'pull_request'

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