feat: enable managing root password

- root password already set in common.eyaml
- add missing param to the accounts::root manifest

site/profiles/manifests/accounts/root.pp

@@ -1,11 +1,13 @@
 # manage the root user
 class profiles::accounts::root (
   Optional[Array[String]] $sshkeys = undef,
+  Optional[String[1]] $password = undef,
 ) {
 
   if $sshkeys {
     accounts::user { 'root':
-      sshkeys => $sshkeys,
+      sshkeys  => $sshkeys,
+      password => $password,
     }
   }