title: Playbook to install all roles in roles/ directory
body: <p>How can my playbook.yml install all roles present in the roles/ directory, rather than specifying every role to run?</p>
  
  <p>The roles that need to be installed are already specified in the requirements.txt file, and I want to specify them only once.</p>
  
  <p>It could look something like:</p>
  
  <pre><code>---
  - hosts: all
  - roles:
      - roles_path: ./roles/*
  </code></pre>