Add changelog check to github workflows #4

	name: Check Changelog

	on:
	pull_request:
	types: [opened, synchronize, reopened]

	jobs:
	check-changelog:
	runs-on: ubuntu-latest

	steps:
	- name: Check out code
	uses: actions/checkout@v4
	with:
	submodules: true

	- name: Check if changelog exists in PR
	id: check_for_changelog
	run: \|
	git fetch origin ${{ github.base_ref }} --depth=1
	if git diff --name-only origin/${{ github.base_ref }} \| grep -q 'CHANGELOG.md'; then
	echo "Changelog file found."
	echo "changelog_exists=true" >> $GITHUB_ENV
	else
	echo "Changelog file not found."
	echo "changelog_exists=false" >> $GITHUB_ENV
	fi

	- name: Fail if no changelog
	if: env.changelog_exists == 'false'
	run: \|
	echo "Error: No CHANGELOG.md file found in this Pull Request."
	exit 1

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