main.yml

# This is a basic workflow to help you get started with Actions

name: CI

# Controls when the workflow will run
on:
  # Triggers the workflow on push or pull request events but only for the main branch
  push:
    branches: [master]
  pull_request:

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  ormolu:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: mrkkrp/ormolu-action@v4
  build:
    name: Build
    runs-on: ubuntu-latest # or macOS-latest, or windows-latest
    needs: ormolu
    steps:
      - uses: actions/checkout@v2
      - uses: haskell/actions/setup@v1
        with:
          ghc-version: "latest"
          enable-stack: true
          stack-version: "latest"
      - name: Cache .stack
        id: cache-stack
        uses: actions/cache@v2
        with:
          path: ~/.stack
          key: ${{ runner.os }}-stack-${{ hashFiles('stack.yaml') }}
          restore-keys: |
            ${{ runner.os }}-stack
            ${{ runner.os }}
      - run: stack build