Use a tag to declare the order of children #2535

	name: "Build"

	on:
	- push
	- pull_request

	jobs:
	build: # Check build on various OSes

	strategy:
	matrix:
	os:
	- ubuntu-latest
	ocaml-compiler:
	- 4.02.x
	- 4.04.x
	- 4.06.x
	- 4.08.x
	- 4.10.x
	- 4.12.x
	- 4.14.x
	- 5.0.x
	- 5.1.x
	include:
	- os: ubuntu-latest
	ocaml-compiler: 5.1.x
	# We don't need to compute coverage for more than one build
	send-coverage: true
	# Mdx tests Mdx tests
	run-mdx: true
	fail-fast: false

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

	steps:
	# Clone the project
	- uses: actions/checkout@v2

	# Setup
	- name: Setup OCaml ${{ matrix.ocaml-version }}
	uses: ocaml/setup-ocaml@v2
	with:
	# Do not pin odoc to not break Mdx installation
	opam-pin: false
	ocaml-compiler: ${{ matrix.ocaml-compiler }}
	opam-local-packages: \|
	odoc.opam

	- name: Install dependencies
	run: opam install -y --deps-only -t ./odoc.opam ./odoc-parser.opam

	- name: dune runtest
	run: opam exec -- dune runtest

	- name: Mdx tests
	if: matrix.run-mdx == true
	run: \|
	opam install -y mdx
	opam exec -- dune build @runmdx

	- name: Send coverage stats to Coveralls
	if: matrix.send-coverage == true
	run: \|
	opam install bisect_ppx
	mkdir -p $BISECT_FILE
	opam exec -- dune runtest --instrument-with bisect_ppx --force
	opam exec -- bisect-ppx-report send-to Coveralls --coverage-path /tmp/coverage
	env:
	BISECT_FILE: /tmp/coverage/bisect
	COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	PULL_REQUEST_NUMBER: ${{ github.event.number }}

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