Update README.md with resolver pin note #78

	name: CI

	# Trigger the workflow on push or pull request, but only for the main branch
	on:
	pull_request:
	push:
	branches: [main]

	jobs:
	stack:
	name: stack / ${{ matrix.os }} / ghc ${{ matrix.ghc }}
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest]
	stack: ["2.7.3"]
	ghc: ["9.0.2"]

	services:
	postgres:
	image: postgres
	env:
	POSTGRES_PASSWORD: roottoor
	POSTGRES_USER: postgres
	POSTGRES_DB: postgres_ws_test
	options: >-
	--health-cmd pg_isready
	--health-interval 10s
	--health-timeout 5s
	--health-retries 5
	ports:
	- 5432:5432
	steps:
	- uses: actions/checkout@v2
	if: github.event.action == 'opened' \|\| github.event.action == 'synchronize' \|\| github.event.ref == 'refs/heads/main'

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

	- uses: actions/[email protected]
	name: Cache ~/.stack
	with:
	path: ~/.stack
	key: ${{ matrix.os }}-${{ matrix.ghc }}-stack-v3

	- name: Build Dependencies
	run: \|
	stack build --system-ghc --test --no-run-tests --only-dependencies

	- name: Build
	run: \|
	stack build --system-ghc --test --no-run-tests

	- name: Test
	run: \|
	stack test --system-ghc

	- name: ${{ matrix.os }} binaries
	uses: actions/upload-artifact@v2
	with:
	name: Store binaries
	path: \|
	.stack-work/dist/**/postgres-websockets

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