build-deploy.yml

name: Build and deploy to GitHub Pages

on:
  push:
    branches: 
      - main

jobs:
  build-deploy:

    name: Build and deploy
    runs-on: ubuntu-latest
    env: 
      GHC_VERSION: '8.10'

    steps:
    - uses: actions/checkout@v3
    - uses: haskell/actions/setup@v2
      with:
        ghc-version: ${{env.GHC_VERSION}}
    - name: Cache ~/.cabal/packages, ~/.cabal/store and dist-newstyle
      uses: actions/cache@v3
      with:
        path: |
          ~/.cabal/packages
          ~/.cabal/store
          dist-newstyle
        key: ${{ runner.os }}-${{ env.GHC_VERSION }}-${{ hashFiles('**/*.cabal', '**/cabal.project', '**/cabal.project.freeze') }}
        restore-keys: ${{ runner.os }}-${{ env.GHC_VERSION }}-
    - run: cabal build --only-dependencies
    - run: cabal build
    - run: cabal exec site build
    - name: Deploy to GitHub Pages
      uses: JamesIves/github-pages-deploy-action@v4.3.3
      with:
        branch: gh-pages
        folder: _site