build.yml

name: "Build"
on:
  pull_request:
  push:
    branches:
      - master

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Set up GHC
        uses: haskell-actions/setup@v2
        id: setup
        with:
          ghc-version: "9.4.8"
          enable-stack: true
          stack-version: "latest"
      - name: Restore cached dependencies
        uses: actions/cache/restore@v3
        id: cache
        env:
          key: ${{ steps.setup.outputs.ghc-version }}-stack-${{ steps.setup.outputs.stack-version }}
        with:
          path: ${{ steps.setup.outputs.stack-root }}
          key: ${{ env.key }}-lock-${{ hashFiles('stack.yaml.lock') }}
          restore-keys: ${{ env.key }}-
      - name: Build example
        run: cd example && stack --no-terminal build --fast
      - name: Save cached dependencies
        uses: actions/cache/save@v3
        # If we had an exact cache hit, trying to save the cache would error because of key clash.
        if: steps.cache.outputs.cache-hit != 'true'
        with:
          path: ${{ steps.setup.outputs.stack-root }}
          key: ${{ steps.cache.outputs.cache-primary-key }}