Add workflow for linting CHANGELOG.md #14

	name: lint-changelog

	on:
	pull_request:
	paths:
	- CHANGELOG.md

	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- name: Check out code
	uses: actions/checkout@v4
	with:
	fetch-depth: '0'
	- name: Install dependencies
	run: \|
	pip install parse-changelog
	- name: Parse changelog to JSON
	run: \|
	parse-changelog --changelog ./CHANGELOG.md > _changelog.json
	- name: Print parsed changelog
	run: \|
	jq . _changelog.json
	- name: Check if introduction is present
	run: \|
	jq -e 'has("introduction")' _changelog.json \|\| (echo "::error file=CHANGELOG.md,line=1,col=1,endColumn=1::Missing introduction" && exit 1)
	- name: Check if introduction title is valid
	run: \|
	jq -e '.introduction \| has("title")' _changelog.json \|\| (echo "::error file=CHANGELOG.md,line=1,col=1,endColumn=1::Missing introduction title" && exit 1)

	TITLE=$(jq -r '.introduction.title' _changelog.json)
	if [ -z "$TITLE" ]
	then
	echo "::error file=CHANGELOG.md,line=1,col=1::Empty introduction title"
	fi
	- name: Check if introduction content is valid
	run: \|
	jq -e '.introduction \| has("content")' _changelog.json \|\| (echo "::error file=CHANGELOG.md,line=1,col=1::Missing introduction content" && exit 1)

	CONTENT=$(jq -r '.introduction.content' _changelog.json)
	if [ -z "$CONTENT" ]
	then
	echo "::error file=CHANGELOG.md,line=1,col=1::Empty introduction content"
	fi
	- name: Check length
	run: \|
	LENGTH=$(jq -r length _changelog.json)
	if [[ "$LENGTH" < 2 ]]
	then
	echo "::error file=CHANGELOG.md,line=1,col=1::Changelog has not enough releases ($LENGTH), or the Markdown structure is incorrect."
	error

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