Bump actions/checkout from 3 to 4 #64

	name: build

	on:
	push:
	branches:
	- main
	paths:
	- ".github/workflows/**"
	- "bench/**"
	- "exe/**"
	- "src/**"
	- "test/**"
	- "package.yaml"
	- "stack*.yaml"
	pull_request:
	branches:
	- main

	jobs:
	build:
	strategy:
	matrix:
	resolver:
	- stack

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- name: Install Haskell
	id: "install-haskell"
	uses: haskell/actions/setup@v2
	with:
	ghc-version: "8.10.7"
	enable-stack: true
	stack-version: "latest"

	- name: Cache .stack
	id: cache-stack
	uses: actions/cache@v3.3.1
	with:
	path: ${{ steps.install-haskell.outputs.stack-root }}
	key: ${{ runner.os }}-${{ matrix.resolver }}-${{ hashFiles(format('{0}.yaml', matrix.resolver)) }}
	restore-keys: \|
	${{ runner.os }}-${{ matrix.resolver }}-
	${{ runner.os }}-

	- name: Install dependencies
	run: \|
	stack --system-ghc --stack-yaml=${{ matrix.resolver }}.yaml --no-terminal build --only-dependencies --fast --test --haddock --bench

	- name: Build
	id: build
	run: \|
	stack --system-ghc --stack-yaml=${{ matrix.resolver }}.yaml --no-terminal build --fast --test --bench --haddock --no-run-tests --no-run-benchmarks

	- name: Deploy documentation
	if: ${{ github.ref == 'refs/heads/main' }}
	uses: JamesIves/github-pages-deploy-action@v4.4.3
	with:
	branch: haddock
	folder: docs

	### uncomment the following lines in order to run the tests every time you
	### push to your repository

	# - name: Test
	# id: test
	# run: \|
	# stack --system-ghc --stack-yaml=${{ matrix.resolver }}.yaml --no-terminal build --fast --test

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