feat: use Dream #28

	name: "Main workflow"
	on:
	pull_request:
	branches:
	- "master"
	push:
	branches:
	- "master"
	jobs:
	nix-build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: cachix/install-nix-action@v22
	with:
	github_access_token: ${{ secrets.GITHUB_TOKEN }}
	- name: Build
	run: nix build
	- name: Build static
	run: nix build .#static
	- name: Test
	run: nix develop --command dune runtest
	- name: Check
	run: nix flake check
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: ocaml/setup-ocaml@v2
	with:
	# Gmp built with musl is required to get the static binary.
	# Obtaining it through Opam is difficult, so building static binary is
	# not checked here for now.
	ocaml-compiler: "5.0"
	- run: opam install . --deps-only --with-test
	- name: Build
	run: opam exec -- dune build
	- name: Test
	run: opam exec -- dune runtest

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