Configure grafana with grafana::cfg doesn't work

Affected Puppet, Ruby, OS and module versions/distributions

Puppet: 5.5.22
Ruby: 2.7.4p191
Distribution: Debian
Module version: 7.0.0

How to reproduce (e.g Puppet code you use)

I used 2 methods :

hiera style

app_mode: 'production'
database:
type: 'postgres'
host: 'pgsql.test.local:5432'
name: 'grafana_db'
user: 'grafana_user'
password: 'grafana'
server:
http_port: 80
users:
allow_sign_up: true
skip_org_role_sync: true

puppet style

class { 'grafana':
  cfg => {
    app_mode => 'production',
    database => {
      type => 'postgres',
      host => 'pgsql.test.local:5432',
      name => 'grafana_db',
      user => 'grafana_user',
      password  => 'grafana',
    },
    server   => {
      http_port     => 80,
    },
    users    => {
      allow_sign_up         => true,
      skip_org_role_sync => true,
    },
  },
}

What are you seeing

With hiera style, none of my grafana::cfg variables are setup into the grafana.ini file
With puppet style, I get an error because the grafana class doesn't have a cfg parameter

What behaviour did you expect instead

Regardless of the method used, my grafana.ini should contain the defined variables

Output log

With hiera cf hiera_output.log

With puppet

Info: Loading facts
Error: Evaluation Error: Error while evaluating a Resource Statement, Class[Grafana]: has no parameter named 'cfg' (file: /tmp/puppet/modules/extends_grafana/manifests/init.pp, line: 19, column: 5) on node infra-grafana-001.test.local

Any additional information you'd like to impart

Into the hiera style, we can see that the module reset the initial grafana.ini file and change the permissions/owner with root and 0744. Whereas into the grafana::config class, normally we should have 0644 for the user/group grafana
Into puppet style, the grafana class has a cfg parameter. So I don't understand why I got that error
```
class grafana (
Optional[String] $archive_source,
String $cfg_location,
Hash $cfg,
....
```

Furthermore, I test other modules versions : 10.0.1, 12.0.0 and 13.1.0. I got the same error.

Last information, I want to use the hiera style (instead of puppet style) because I can configure my grafana instance without create a puppet module

Thanks in advance for your help

voxpupuli / puppet-grafana

Configure grafana with grafana::cfg doesn't work #353