ci #71

	# taken from https://github.com/kowainik/summoner/blob/main/.github/workflows/ci.yml
	name: ci

	on:
	# Build every pull request, to check for regressions.
	pull_request:
	types: [opened, reopened, synchronize]

	# Build when a PR is merged, to update the README's CI badge.
	push:
	branches: [main]

	# Build once a month, to detect missing upper bounds.
	schedule:
	- cron: '0 0 1 * *'

	jobs:
	stack:
	name: stack / ghc ${{ matrix.ghc }}
	runs-on: ubuntu-latest
	strategy:
	matrix:
	stack: ["2.9.1"]
	ghc:
	- "8.10.7"
	- "9.0.2"
	- "9.2.8"
	- "9.4.8"
	- "9.6.3"

	steps:
	- uses: actions/checkout@v2

	- uses: haskell/actions/setup@v1
	name: Setup Haskell Stack
	with:
	ghc-version: ${{ matrix.ghc }}
	stack-version: ${{ matrix.stack }}

	- uses: actions/cache@v1
	name: Cache ~/.stack
	with:
	path: ~/.stack
	key: ${{ runner.os }}-${{ matrix.ghc }}-stack

	- name: Install dependencies
	run: \|
	stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks --only-dependencies
	- name: Build
	run: \|
	stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks
	- name: Test
	run: \|
	stack test --system-ghc

Provide feedback