title: why I can run docker-compose in Github action without install it
body: <p>I make a copy/paste from <a href="https://faun.pub/building-a-ci-cd-pipeline-with-github-actions-and-docker-part-1-a9d8709c31fb" rel="nofollow noreferrer">the link</a> here. I am confused about why I can run <strong>docker-compose</strong> without installing it. When I test locally using &quot;act&quot;, it will give me an error about <em><strong>docker-compose command not found</strong></em>.</p>
  <pre><code>name: CI-dev-pipeline
  on:
    push:
      branches: [ develop ]
    pull_request:
      branches: [ develop ]
  jobs:
    build:
      runs-on: ubuntu-latest
      container:
        image: lucasalt/act_base:latest
      steps:
        - uses: actions/checkout@v2
          with:
            path: &quot;&lt;INSERT_NAME_OF_REPOSITORY&gt;&quot;
  
      - name: Build docker
        run: | 
          docker-compose -f ./&lt;REPO_NAME&gt;/docker-compose.test.yml -p testing up -d
  </code></pre>