Change default path to shared download volume

hyrax/app/helpers/download_helper.rb

@@ -49,15 +49,15 @@ module DownloadHelper
   end
 
   def base_download_dir
-    File.join(ENV.fetch('DOWNLOAD_PATH', 'tmp/downloads'), work.id)
+    File.join(ENV.fetch('DOWNLOAD_PATH', '/shared/downloads'), work.id)
   end
 
   def zip_file_path
-    File.join(ENV.fetch('DOWNLOAD_PATH', "tmp/downloads"), "#{work.id}.zip")
+    File.join(ENV.fetch('DOWNLOAD_PATH', "/shared/downloads"), "#{work.id}.zip")
   end
 
   def shell_file_path
-    File.join(ENV.fetch('DOWNLOAD_PATH', "tmp/downloads"), "#{work.id}.sh")
+    File.join(ENV.fetch('DOWNLOAD_PATH', "/shared/downloads"), "#{work.id}.sh")
   end
 
   def cleanup_path(file_path)

hyrax/app/helpers/search_download_helper.rb

@@ -23,7 +23,7 @@ module SearchDownloadHelper
   end
 
   def shell_file_path
-    @shell_file_path ||= File.join(ENV.fetch('DOWNLOAD_PATH', "tmp/downloads"), "users/#{shell_file_name}")
+    @shell_file_path ||= File.join(ENV.fetch('DOWNLOAD_PATH', "/shared/downloads"), "users/#{shell_file_name}")
   end
 
   def shell_file_name