Satellites / remote exec support?

[zbal]

Nice to have feature; especially to allow having 1 central front-facing pipelines and executioners in different locations - sometime internal within a LAN.

Proposed (high-level) implementation could be:

• have a satellite mode for pipeline, that starts headless
• expect to connect to a remote master
  • remote master would "see" incoming request and accept them (?)
  • remote master would display a code to include upon start of the satellite to effectively link the satellite to the master
• the satellite would fetch the tasks from the master (?)
• or the master would allow creation of pipelines and select which satellite to send it to
• the satellite would maintain connection with the master via ...
• webhooks hitting the master would then be routed back to the satellites for execution ...

Not required - and quite heavy work but .. keeping it here