Enable file transfer from within scripts

[raoulmillais]

Example scenarios:

• registering a custom task on remote servers.
• applying a registry fix on remote servers (reg file instead of the CLI api)

Considerations:

• Transfer behaviour when running on local target.

Questions:

• Is upload enough? Are there use-cases for downloading?

Ideally it would be useful to keep self-contained server configuration or maintenance scripts with the source for the project. This works fine at the moment provided your maintenance scripts don't rely on a file being transferred to the remote targets. I.E. Transferring the dependent scripts separately from roadrunner script means gluing together the pieces (transfer / roadrunner) with some extra layer on the script, it also usually means that you need to maintain ssh credentials in 2 places.