name: Build site

on:
  push:
    branches:
      - master
    paths:
      - '.github/workflows/build.yml'
      - 'README.md'

jobs:
  build_site:
    runs-on: ubuntu-latest
    name: Build site
    steps:
      - uses: actions/checkout@master
        with:
          fetch-depth: 1
      - uses: actions/setup-node@master
        with:
          node-version: '12.x'
      - name: Determine npm cache directory
        id: npm-cache
        run: |
          echo "::set-output name=dir::$(npm config get cache)"
      - name: Restore npm cache
        uses: actions/cache@v1
        with:
          path: ${{ steps.npm-cache.outputs.dir }}
          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
          restore-keys: |
            ${{ runner.os }}-node-
      - run: npm run build