feat: Set up markdownlint GitHub Action for automated linting (Closes #14) #5

	name: Linting

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	permissions:
	contents: write

	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v6
	with:
	fetch-depth: 0

	# This identifies which files changed in the specific commit or PR
	- uses: tj-actions/changed-files@v47
	id: changed-files
	with:
	files: '*/.md'
	separator: ","

	# This runs the linter ONLY on the files identified above
	- uses: DavidAnson/markdownlint-cli2-action@v22
	if: steps.changed-files.outputs.any_changed == 'true'
	with:
	globs: ${{ steps.changed-files.outputs.all_changed_files }}
	separator: ","
	fix: true

	# Check if anything was fixed, then Commit & Push
	- name: Commit and push fixes
	if: always() && steps.changed-files.outputs.any_changed == 'true'
	run: \|
	# Configure the bot's identity
	git config --global user.name "github-actions[bot]"
	git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"

	# Check if the linter modified any files
	if [[ -n $(git status -s) ]]; then
	git add .
	git commit -m "style: auto-fix markdown formatting"
	git push origin HEAD:${{ github.head_ref }}
	fi

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