Checkout on pull_request -> closed event about checkout HOT 6 CLOSED

on:
  pull_request:
    branches:
    - master
    types: [opened, synchronize, closed]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

- uses: actions/checkout@v1
  with:
    ref: refs/heads/${{ github.head_ref }} # it could be ${{ github.base_ref }} also

name: Build

on:
  pull_request:
    branches:
    - master
    types: [opened, synchronize, closed]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
    - name: Git Checkout PR Ref
      if: github.event.action != 'closed'
      uses: actions/checkout@v1

    - name: Git Checkout Base Ref
      if: github.event.pull_request.merged == true
      uses: actions/checkout@v1
      with:
        ref: refs/heads/${{ github.base_ref }}

    steps:
      - uses: actions/checkout@v2
        name: Checkout PR
        if: github.event_name == 'pull_request'
        with:
          ref: ${{ github.event.pull_request.head.sha }}

      - uses: actions/checkout@v2
        name: Checkout Branch
        if: github.event_name == 'push'