Added Arch Linux instructions to INSTALL.md #360

	name: Build on PR
	on:
	pull_request:
	push:
	paths:
	- '.github/workflows/pr.yml'
	schedule:
	- cron: '42 5 20 * *'
	jobs:
	test:
	name: Build and Test
	runs-on: ${{ matrix.operating-system }}
	strategy:
	fail-fast: false
	matrix:
	operating-system: [
	macos-latest,
	ubuntu-latest]
	ocaml-compiler: [
	'0',
	'1',
	'2',
	]
	steps:
	- name: Install deps
	if: matrix.operating-system == 'ubuntu-latest'
	run: \|
	sudo apt-get update
	sudo apt-get install --yes time
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: '3.10'
	- uses: actions/checkout@v2
	- name: Get OCaml version
	run: \|
	INDEX=${{ matrix.ocaml-compiler }}
	OCAML_VERSION=\
	`python .github/workflows/ocaml_versions.py $INDEX`
	echo "OCAML_VERSION=$OCAML_VERSION" \
	>> $GITHUB_ENV
	echo "OCAML_VERSION = $OCAML_VERSION"
	- uses: ocaml/setup-ocaml@v2
	with:
	ocaml-compiler: ${{ env.OCAML_VERSION }}
	# - uses: actions/cache@v3
	# id: cache
	# with:
	# path: _build_cache
	# key: ${{ runner.os }}_build_cache
	- name: Build installer of TLAPS
	run: \|
	eval $(opam env)
	opam install ./ --deps-only --yes
	make
	make release
	- name: Run a subset of `tlapm` tests
	run: \|
	eval $(opam env)
	make test-inline test-fast-basic
	- name: Run all `tlapm` tests
	run: \|
	eval $(opam env)
	make test
	- name: Print Test Results
	if: matrix.operating-system == 'ubuntu-latest'
	run: \|
	cat _build/default/test/tests.log

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