pfsense acme certificate and upload via sftp to wing-ftp server.

We want to let pfsense/acme create a "let's encrypt" and then transfer it to the wing-ftp server and reload the certificate on the wing-ftp server.
Let's go!

Requirements:
- A DNS-Provider with API
- FTP-Username on the wing-ftp host: pfsense

1. pfsense: Create a key for password free login from the pfsense(root) user to the wingftp-user(username=pfsense)
	a. on the pfsense cli type the command (no passphrase)
	[ssh-keygen -t rsa]
    b. view the new key
	[cat /root/.ssh/id_rsa.pub]
2. pfsense: Create a account key and certificate, search "pfsense acme api" on youtube or websites..
3. wingftp-host: Copy the cli output to the wing-ftp server in a file (c:\sshkeys\root@pfsense.txt)
4. wingftp-host: Create the ftp-user in the wingftp admincenter > domain/user
5. wingftp-host: Change the ftp-user In the wingftp admincenter > domain/user/limit/ssh key authentication this file path, and set use authentication over public key
6. pfsense: Services/Certificates/Edit/Action list at the command:
	echo 'mput /conf/acme/ftp.* /' | sftp pfsense@ftp
7. wingftp-host: add the lua script
Put this Script in Admin-Webinterface /SSH Events/OnFileUploaded
Change your variables!

local username = "%Name"
if username == "pfsense" then
  local strFileName = "%FileName"
  local strDomain = "mydomain.net"
  local strSubject = "FTP Zertifikat wurde hochgeladen"
  local strText = "WingFTP Zertifikat für Domain " .. strDomain .. " wird neu geladen!"
  if string.find(strFileName,"ftp.mydomain.net.crt") then
    c_SendMail("administrator@mydomain.net", strSubject, strText, "", "myDomain")
    c_SetOptionInt(strDomain, DOPTION_TLS_SESSION_TIMEOUT, 3600+(c_GetRandom()%100))
  end
end