Rework api_key_path assignment with if-else

Co-authored-by: Olivier Halligon <[email protected]>

Author: mokagio

fastlane/Fastfile

@@ -939,13 +939,14 @@ platform :ios do
   #
   # @option [Boolean] readonly (default: true) Whether to only fetch existing certificates and profiles, without generating new ones.
   private_lane :alpha_code_signing do |options|
-    api_key_path = ASC_KEY_PATH
     readonly = options.fetch(:readonly, true)
 
-    unless readonly
+    if readonly
+      # In readonly mode, we can use the API key
+      api_key_path = ASC_KEY_PATH
+    else
       # The Enterprise account APIs do not support authentication via API key.
-      # If we want to modify data (readonly = false) we need to authenticate
-      # manually.
+      # If we want to modify data (readonly = false) we need to authenticate manually.
       prompt_user_for_app_store_connect_credentials
       # We also need to pass no API key path, otherwise Fastlane will give
       # precedence to that authentication mode.