preview-build.yml

# Each PR will build preview site that help to check code is work as expect.

name: Preview Build

on: 
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  # Prepare node modules. Reuse cache if available
  setup:
    name: prepare preview
    runs-on: ubuntu-latest
    steps:
      - name: checkout
        uses: actions/checkout@master

      - name: cache package-lock.json
        uses: actions/cache@v2
        with:
          path: package-temp-dir
          key: lock-${{ github.sha }}

      - name: create package-lock.json
        run: npm i --package-lock-only

      - name: hack for single file
        run: |
          if [ ! -d "package-temp-dir" ]; then
            mkdir package-temp-dir
          fi
          cp package-lock.json package-temp-dir
      - name: cache node_modules
        id: node_modules_cache_id
        uses: actions/cache@v2
        with:
          path: node_modules
          key: node_modules-${{ hashFiles('**/package-temp-dir/package-lock.json') }}

      - name: install
        if: steps.node_modules_cache_id.outputs.cache-hit != 'true'
        run: npm ci

  build-site:
    name: build preview
    runs-on: ubuntu-latest
    needs: setup
    steps:
      - name: checkout
        uses: actions/checkout@master

      - name: restore cache from package-lock.json
        uses: actions/cache@v2
        with:
          path: package-temp-dir
          key: lock-${{ github.sha }}

      - name: restore cache from node_modules
        uses: actions/cache@v2
        with:
          path: node_modules
          key: node_modules-${{ hashFiles('**/package-temp-dir/package-lock.json') }}

      - name: npm run site
        id: site
        run: npm run site

      - name: upload site artifact
        uses: actions/upload-artifact@v2
        with:
          name: site
          path: _site/
          retention-days: 5

      # Upload PR id for next workflow use
      - name: Save PR number
        if: ${{ always() }}
        run: echo ${{ github.event.number }} > ./pr-id.txt

      - name: Upload PR number
        if: ${{ always() }}
        uses: actions/upload-artifact@v2
        with:
          name: pr
          path: ./pr-id.txt