Fix: Make SFTP upload file as tempfile

[casaper]

future_kids/lib/tasks/xls_export.rb

Line 11 in a8d68f2

File.write(File.join('tmp', filename), content)

It is not suggested to save such a file like that. This should be done with Ruby std-lib Tempfile.

The way this is implemented now is not advised as is, neither security nor stability wise.

But the good news is, that this is very easy to implement.

[casaper]

require 'tempfile'
tempfile = Tempfile.new(filename)
tempfile.write(rendered_xlsx)
Net::SFTP.start(ENV['SFTP_HOST'], ENV['SFTP_USER'], password: ENV['SFTP_PASS']) do |sftp|
  sftp.upload!(tempfile.path, filename)
end
tempfile.unlink