Request: Add images for testing non-direct filesystems.

[costdev]

The Issue

Manual testing for non-direct filesystems like WP_Filesystem_FTPext, WP_Filesystem_ftpsockets and WP_Filesystem_SSH2 is very difficult to get due to the limited number of contributors who use these filesystems. In addition, not all FTP servers behave alike, so testing a single FTP server isn't reliable.

The Request

• Create images that set up WordPress to use ftpext, ftpsockets and ssh2 values for FS_METHOD.
• For FTP, provide images that cover different servers, such as vsftpd, PureFTPd, and ProFTPD initially. Others, such as EasyBSD FTP, or Filezilla could be added too. This will help identify issues that limited manual testing can often miss.

Notes

• Related Trac ticket
• Unfortunately, I don't have the knowledge to submit a PR for this, but I'm happy to discuss this with anyone who has the skillset.