chores(ci): add new changelog gen workflow #7

	name: Changelog Update

	on:
	pull_request:
	branches:
	- main
	types: [opened, synchronize, reopened]

	permissions: write-all

	jobs:
	update_changelog:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v2
	with:
	fetch-depth: 0

	- name: Set up Node.js
	uses: actions/setup-node@v2
	with:
	node-version: "18"

	- name: Install conventional-changelog-cli
	run: npm install -g conventional-changelog-cli

	- name: Get PR title
	id: pr_title
	run: echo "::set-output name=title::$(jq --raw-output .pull_request.title $GITHUB_EVENT_PATH)"

	- name: Generate changelog diff
	run: \|
	git fetch origin main:main
	conventional-changelog -p angular -i CHANGELOG.md -s -r 0 > changelog_diff.md
	echo "### ${GITHUB_REF##*/} - ${{ steps.pr_title.outputs.title }}" >> changelog_diff.md
	echo "::set-output name=changelog::$(cat changelog_diff.md)"

	- name: Commit and push changelog update
	run: \|
	git config user.name 'github-actions'
	git config user.email '[email protected]'
	git add CHANGELOG.md
	git commit -m "Update CHANGELOG.md [skip ci]"
	git push origin HEAD:refs/heads/${{ github.head_ref }}

Provide feedback