Add prune_white_list to config file.

Author: Guido Marucci Blas

lib/carthage_cache/application.rb

@@ -38,13 +38,17 @@ def install_archive
     def create_archive(force = false, prune = nil, prune_white_list = nil, platforms = nil)
       prune ||= config.prune_on_publish
       platforms ||= config.platforms
+      prune_white_list ||= config.prune_white_list
+
       if force || !archive_exist?
         prune_build_directory(prune_white_list) if prune
         archive_builder.build(platforms)
       end
     end
 
     def prune_build_directory(white_list)
+      white_list ||= config.prune_white_list
+      
       if white_list && File.exist?(white_list)
         terminal.vputs "Prunning build directory with white list '#{white_list}' ..."
         white_list = YAML.load(File.read(white_list))

lib/carthage_cache/configuration.rb

@@ -28,6 +28,7 @@ def self.default
       @default ||= Configuration.new({
         prune_on_publish: false,
         platforms: nil,
+        prune_white_list: nil,
         aws_s3_client_options: {
           region: ENV['AWS_REGION'],
           access_key_id: ENV['AWS_ACCESS_KEY_ID'],
@@ -40,6 +41,7 @@ def self.default
 
     config_key :bucket_name
     config_key :prune_on_publish
+    config_key :prune_white_list
     config_key :platforms
     config_key :aws_region
     config_key :aws_access_key_id