deploy.yml

name: Build and Deploy Docs site

on:
  push:
    branches: ["main"]
jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node-version: [16.x] # Are you are missing this specification?
    steps:
      - uses: actions/checkout@v2
      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v2
        with:
          node-version: ${{ matrix.node-version }}
          cache: "npm"
          cache-dependency-path: "**/package-lock.json" # THIS PATTERN did the trick for me.
      - run: npm install && npm run build && touch build/.nojekyll
      - name: Deploy 🚀
        uses: JamesIves/github-pages-deploy-action@v4.2.5
        with:
          folder: build
          branch: gh-pages # The branch the action should deploy to.