build.yml

name: Build Eleventy
on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-20.04

    strategy:
      matrix:
        node-version: [16.x]

    steps:
      - uses: actions/checkout@v3

      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v3
        with:
          node-version: ${{ matrix.node-version }}

      - name: Install dependencies & build
        run: |
          npm ci
          npm run build
      - name: Deploy
        uses: peaceiris/actions-gh-pages@v3.9.3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          #publish_dir is the folder on the docker instance which eleventy builds the pages to. 
          #it is not the docs folder in the repository
          publish_dir: public
          #publish_branch is the branch in the repository.
          #this is where you need to point GitHub pages
          publish_branch: gh-pages