title: Github Action: Split Long Command into Multiple Lines
body: <p>I have a Github action command that is really long:</p>
  <pre><code>name: build
  
  on: [push]
  
  jobs:
      build:
          runs-on: ubuntu-18.04
          steps:
              - uses: actions/checkout@v1
              - name: Install Prerequisites
                run: |
                  sudo apt-get update
                  sudo apt-get install -y --no-install-recommends &quot;a very very long list of prerequisites&quot;
  </code></pre>
  <p>May I know whether it is possible to split the long command into multiple lines for better readability? I have tried the separator '' but it does not work.</p>