Make configuarable s3_permissions for paperclip (#2139)

config/initializers/paperclip.rb

@@ -16,7 +16,7 @@ if ENV['S3_ENABLED'] == 'true'
   Paperclip::Attachment.default_options[:s3_host_name]   = ENV.fetch('S3_HOSTNAME') { "s3-#{ENV.fetch('S3_REGION')}.amazonaws.com" }
   Paperclip::Attachment.default_options[:path]           = '/:class/:attachment/:id_partition/:style/:filename'
   Paperclip::Attachment.default_options[:s3_headers]     = { 'Cache-Control' => 'max-age=315576000' }
-  Paperclip::Attachment.default_options[:s3_permissions] = 'public-read'
+  Paperclip::Attachment.default_options[:s3_permissions] = ENV.fetch('S3_PERMISSION') { 'public-read' }
   Paperclip::Attachment.default_options[:s3_region]      = ENV.fetch('S3_REGION') { 'us-east-1' }
 
   Paperclip::Attachment.default_options[:s3_credentials] = {