ftp upload support

[pcm32]

Currrently the Galaxy Helm chart v3 does not provide support for an ftp upload mechanism, which was the case in v2. Unless that more modern Galaxy versions have a better way of upload large files, which should probably add this support again. Unfortunately, there is no existing proftpd chart to simply re-use as dependency. So we need to decide whether to write a chart for that and use as dependency, or simply add all the logic on the current chart, reusing partly what was there for proftpd on chart v2.

[afgane]

We're going through a security audit for the chart v3 and one of the things the collaborators for this audit stated when we brought up FTP is that it is generally a very high risk service to add. Meanwhile, have you seen the external data source import capability that was recently added (galaxyproject/galaxy#9888)? It may replace a lot of the need for ftp.