Ensure we don't load the secrets more than once

Secrets were being created twice, which might require logging in twice.

lib/kamal/configuration.rb

@@ -48,6 +48,8 @@ class Kamal::Configuration
 
     validate! raw_config, example: validation_yml.symbolize_keys, context: "", with: Kamal::Configuration::Validator::Configuration
 
+    @secrets = Kamal::Secrets.new(destination: destination)
+
     # Eager load config to validate it, these are first as they have dependencies later on
     @servers = Servers.new(config: self)
     @registry = Registry.new(config: self)
@@ -63,8 +65,6 @@ class Kamal::Configuration
     @ssh = Ssh.new(config: self)
     @sshkit = Sshkit.new(config: self)
 
-    @secrets = Kamal::Secrets.new(destination: destination)
-
     ensure_destination_if_required
     ensure_required_keys_present
     ensure_valid_kamal_version
@@ -259,10 +259,6 @@ class Kamal::Configuration
     }.compact
   end
 
-  def secrets
-    @secrets ||= Kamal::Secrets.new(destination: destination)
-  end
-
   private
     # Will raise ArgumentError if any required config keys are missing
     def ensure_destination_if_required