Read host from application url for persistent hostpath

hyrax/config/initializers/hyrax.rb

@@ -53,7 +53,7 @@ Hyrax.config do |config|
   # config.temp_file_base = '/home/developer1'
 
   # Hostpath to be used in Endnote exports
-  # config.persistent_hostpath = 'http://localhost/files/'
+  config.persistent_hostpath = "#{ENV['APPLICATION_URL'] || 'http://localhost'}/files/"
 
   # If you have ffmpeg installed and want to transcode audio and video set to true
   config.enable_ffmpeg = true