Added external cmark library #336

	# Please read the TESTING file before modifying this file

	# Specific workflow for MacPorts, as we need to disable Brew for this to work
	# so it's difficult to use the other standard workflows.

	name: Build Crate (MacPorts)
	# Build the crate with a native toolchain from Alire

	env:
	CHECKS_ORG: alire-project
	CHECKS_REPO: alire-index-checks
	ALR_VERSION: 2.0.1

	on:
	pull_request:
	paths:
	- 'index/**.toml'

	jobs:

	build:
	name: ${{ matrix.os }}

	runs-on: ${{ matrix.os }}

	strategy:
	fail-fast: false
	matrix:
	os:
	- macos-12

	steps:
	- name: Check out alire-index
	uses: actions/checkout@v2
	with:
	fetch-depth: 0
	# Needed to be able to diff and obtain changed files. Furthermore, we
	# need the full history or else grafted partial branches confuse the
	# changed files detectors (in both scripts/gh-build-crate.sh and
	# check-author action).

	- name: Check out alire-index-checks
	uses: actions/checkout@v3
	with:
	repository: ${{env.CHECKS_ORG}}/${{env.CHECKS_REPO}}
	ref: ${{github.base_ref}}
	path: ${{env.CHECKS_REPO}}

	- name: Set up stable `alr`
	uses: alire-project/setup-alire@v3
	with:
	version: ${{env.ALR_VERSION}}

	- name: Disable Homebrew
	run: rm -f $(which brew)
	shell: bash

	- name: Install Ports
	uses: melusina-org/setup-macports@v1

	- name: Prefer Quartz to X11 for MacPorts
	shell: bash
	run: echo '-x11 +no_x11 +quartz' >> /opt/local/etc/macports/variants.conf

	- name: Test crate
	run: ${{env.CHECKS_REPO}}/scripts/gh-build-crate.sh
	shell: bash

Provide feedback