Add installation instructions #21

	name: Changelog Check

	on:
	pull_request:
	types:
	- opened
	- synchronize
	- reopened

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

	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Debug changed files
	run: \|
	echo "Changed files:"
	echo "${{ github.event.pull_request.changed_files }}"

	- name: Get all changed markdown files
	id: changed-markdown-files
	uses: tj-actions/changed-files@v44
	with:
	# Avoid using single or double quotes for multiline patterns
	files: \|
	**.md

	- name: List all changed files markdown files
	if: steps.changed-markdown-files.outputs.any_changed == 'true'
	env:
	ALL_CHANGED_FILES: ${{ steps.changed-markdown-files.outputs.all_changed_files }}
	run: \|
	for file in ${ALL_CHANGED_FILES}; do
	echo "$file was changed"
	done

	- name: Check for CHANGELOG.md update
	id: changelog-check
	run: \|
	if ! grep -q "CHANGELOG.md" <<< "${{ steps.changed-markdown-files.outputs.all_changed_files }}"; then
	echo "Each PR must include an update to the CHANGELOG.md file."
	echo "::set-output name=comment::Each PR must include an update to the CHANGELOG.md file."
	echo "::set-output name=changelog-updated::false"
	else
	echo "CHANGELOG.md update found."
	echo "::set-output name=changelog-updated::true"
	fi

	- name: Prevent PR merge if CHANGELOG.md is not updated
	if: steps.changelog-check.outputs.changelog-updated == 'false'
	run: \|
	echo "The CHANGELOG.md file must be updated before merging."
	exit 1

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