add environment and group

manifests/init.pp

@@ -197,6 +197,10 @@ class mastodon (
   exec { 'install_mastodon':
     command     => '/usr/local/bin/install_mastodon.sh',
     user        => $mastodon_user,
+    group       => $mastodon_group,
+    environment => [
+      "HOME=${mastodon_home}",
+    ],
     creates     => "${mastodon_home}/./.mastodon_install",
     path        => "${mastodon_home}/.rbenv/shims:${mastodon_home}/.rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
     timeout     => 0,