RFC: Migrate Smart Proxy Dynflow Core to Dynflow Plugins and API

[ehelms]

I am closing this RFC as a newer RFC supersedes and renders this one no longer needed:

Phasing out smart_proxy_dynflow_core

Intro In the early days of remote execution, we wanted to get dynflow to the smart proxy to be able to reuse some code we had on Foreman’s side and to have the same engine on both sides. Sadly at the time, smart proxy wasn’t SCL’d and Dynflow required newer ruby than what was available outside of SCL. To address this situation, we created smart_proxy_dynflow and smart_proxy_dynflow_core gems. smart_proxy_dynflow_core is a sidecar service to the smart proxy, essentially just Dynflow runtime with…