Corregge cloud-init montato, PublisherOnline multi-nodo e E2E locale-aware.

Senza volume stream-node i nodi Hetzner nascevano senza MediaMTX; sync live usa ora Client.for_session e rtmpconns (MediaMTX 1.20).

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/streams/cloud_providers/hetzner.rb

@@ -40,7 +40,7 @@ module Streams
         network_id = ENV["HCLOUD_NETWORK_ID"].presence
         body[:networks] = [network_id.to_i] if network_id
         user_data = cloud_init_user_data
-        body[:user_data] = user_data if user_data.present?
+        body[:user_data] = user_data
 
         data = post("servers", body)
         server = data["server"] || {}
@@ -114,9 +114,16 @@ module Streams
 
       def cloud_init_user_data
         path = ENV["HCLOUD_USER_DATA_FILE"].presence
-        return File.read(path) if path && File.file?(path)
+        if path.present?
+          raise Error, "HCLOUD_USER_DATA_FILE non leggibile nel container: #{path}" unless File.file?(path)
 
-        ENV["HCLOUD_USER_DATA"].presence
+          return File.read(path)
+        end
+
+        inline = ENV["HCLOUD_USER_DATA"].presence
+        raise Error, "Manca cloud-init: imposta HCLOUD_USER_DATA_FILE (montato) o HCLOUD_USER_DATA" if inline.blank?
+
+        inline
       end
 
       def conn