Adjust CI and operating system constraints #1

	# Credit for this workflow:
	# https://sim642.eu/blog/2022/03/13/ocaml-dependencies-lower-bounds-ci/
	name: Lower bounds

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

	jobs:
	lower-bounds:
	fail-fast: false
Check failure on line 15 in .github/workflows/lower-bounds.yml View workflow run for this annotation GitHub Actions / Lower bounds Invalid workflow file `The workflow is not valid. .github/workflows/lower-bounds.yml (Line: 15, Col: 5): Unexpected value 'fail-fast'`
	strategy:
	matrix:
	os:
	- ubuntu-latest
	- macos-latest
	ocaml-compiler:
	- "4.14"
	- "5.1"
	runs-on: ${{ matrix.os }}
	env:
	OPAMCONFIRMLEVEL: unsafe-yes # allow opam depext to yes package manager prompts
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Set up OCaml ${{ matrix.ocaml-compiler }}
	uses: ocaml/setup-ocaml@v2
	with:
	ocaml-compiler: ${{ matrix.ocaml-compiler }}
	dune-cache: true
	allow-prerelease-opam: true
	- name: Install dependencies
	run: opam install . --deps-only --with-test
	- name: Install opam-0install
	run: opam install opam-0install
	- name: Downgrade dependencies
	run: opam install --unlock-base $(opam exec -- opam-0install --prefer-oldest --with-test smtml)
	- name: Build
	run: opam exec -- dune build @install
	- name: Test
	run: opam exec -- dune runtest

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