mysql_install.pp

$users = {
  'gitlab_user@localhost' => {
    ensure                   => 'present',
    password_hash            => mysql_password('changeme'),
  },
}

$grants = {
  'gitlab_user@localhost/gitlab_db.*' => {
    ensure     => 'present',
    options    => ['GRANT'],
    privileges => ['ALL'],
    table      => 'gitlab_db.*',
    user       => 'gitlab_user@localhost',
  },
}

$databases = {
  'gitlab_db' => {
    ensure  => 'present',
    charset => 'utf8',
  },
}

class { '::mysql::server':
  users => $users,
  grants => $grants,
  databases => $databases,
}