add precompile of assets

manifests/init.pp

@@ -276,5 +276,18 @@ class mastodon (
   }
   # db:create
   # RAILS_ENV=production rails assets:precompile
+  exec { 'assets_precompile':
+    command     => "${mastodon_home}/live/bin/rails assets:precompile > ${mastodon_home}/assets_precompile_done",
+    creates     => "${mastodon_home}/assets_precompile_done",
+    path        => "${mastodon_home}/.rbenv/shims:${mastodon_home}/.rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+    environment => [
+      'RAILS_ENV=production',
+    ],
+    user        => $mastodon_user,
+    group       => $mastodon_group,
+    cwd         => "${mastodon_home}/live",
+    timeout     => 0,
+    require     => File["${mastodon_home}/live/.env.production"],
+  }
   # Apache::vhost
 }