Improve CI to unpack into fresh directory #6

	name: Build
	on:
	- push
	- pull_request

	defaults:
	run:
	shell: bash

	jobs:
	main:
	name: GHC ${{ matrix.ghc }} on ${{ matrix.os }}
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest]
	ghc:
	- "9.2"
	- "9.4"
	- "9.6"
	include:
	- os: macOS-latest
	ghc: "9.6"
	- os: windows-latest
	ghc: "9.6"
	steps:
	- uses: actions/checkout@v3
	- uses: haskell/actions/setup@v2
	id: setup-haskell-cabal
	with:
	ghc-version: ${{ matrix.ghc }}
	cabal-version: "latest"
	cabal-update: true
	- uses: actions/cache@v3
	name: Cache cabal stuff
	with:
	path: \|
	${{ steps.setup-haskell-cabal.outputs.cabal-store }}
	dist-newstyle
	key: ${{ runner.os }}-${{ matrix.ghc }}

	- name: Cabal version
	run: \|
	cabal --version

	- name: Install doctest
	run: \|
	mkdir -p "${{github.workspace}}/doctest-bin"
	cabal install --install-method=symlink --installdir "${{github.workspace}}/doctest-bin" doctest

	- name: Unpack
	run: \|
	cabal sdist --ignore-project --output-directory ..
	cd ..
	cabal get prettyprinter-combinators-*.tar.gz

	- name: Build
	run: \|
	cd ../prettyprinter-combinators-*/
	cabal build all --enable-tests --enable-benchmarks

	- name: Doctest
	run: \|
	cd ../prettyprinter-combinators-*/
	cabal repl --with-ghc "${{github.workspace}}/doctest-bin/doctest" --repl-options=-Wno-missing-export-lists 'lib:prettyprinter-combinators'

	- name: Haddock
	run: \|
	cd ../prettyprinter-combinators-*/
	cabal haddock all

	- name: Cabal check
	run: \|
	cd ../prettyprinter-combinators-*/
	cabal check

Provide feedback