CI: Use latest cabal instead of a specific version #372

	name: Haskell CI

	on: [push]

	jobs:
	build:
	runs-on: ${{ matrix.os }}

	defaults:
	run:
	shell: bash

	strategy:
	fail-fast: false
	matrix:
	ghc: ["8.10.7", "9.2.8", "9.6.2"]
	os: [ubuntu-latest, macos-latest, windows-latest]

	steps:
	- uses: actions/checkout@v1

	- uses: haskell/actions/setup@v1
	id: setup-haskell
	with:
	ghc-version: ${{ matrix.ghc }}
	cabal-version: latest

	- name: Haskell versions
	run: \|
	ghc --version
	cabal --version

	- name: Cabal update
	run: cabal update

	- name: Cabal Configure
	run: cabal build all --dry-run --enable-tests --enable-benchmarks --write-ghc-environment-files=always

	- name: Record dependencies
	run: \|
	cat dist-newstyle/cache/plan.json \| jq -r '."install-plan"[].id' \| sort \| uniq > dependencies.txt

	- name: Set cache version
	run: echo "CACHE_VERSION=9w76Z3Q" >> $GITHUB_ENV

	- uses: actions/cache@v2
	name: Cache cabal store
	with:
	path: ${{ steps.setup-haskell.outputs.cabal-store }}
	key: cache-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('dependencies.txt') }}
	restore-keys: \|
	cache-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('dependencies.txt') }}
	cache-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}-

	- name: Install dependencies
	run: \|
	cabal update
	cabal build all --only-dependencies

	- name: Build
	run: cabal build all

	- name: Run tests
	run: cabal test all

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