title: gitlab multiline line config in docker compose file
body: <p>In docker-compose.yml cannot add to environment var GITLAB_OMNIBUS_CONFIG ldap multiline yaml configuration, because:</p>
  
  <pre><code># Add any other gitlab.rb configuration here, each on its own line
  gitlab_rails['ldap_servers'] = YAML.load &lt;&lt;-'EOS'
  main:
    label: 'LDAP'
    host: 'ldap.&lt;&gt;.local'
    port: 389
    uid: 'uid'
    bind_dn: 'uid=&lt;&gt;,ou=People,dc=,dc='
    password: '&lt;&gt;'
    encryption: 'plain' # "start_tls" or "simple_tls" or "plain"
    base: '&lt;&gt;'
    attributes:
      username: ['uid', 'userid', 'sAMAccountName']
      email:    ['mail', 'email', 'userPrincipalName']
      name:       'cn'
      first_name: 'givenName'
      last_name:  'sn'
  EOS
  </code></pre>
  
  <p>Are there solution?</p>