New Feature: Desktop application for ST2 Flow

[mickmcgrath13]

Problem

The drag and drop editor is really nice, but at scale, it bypasses source control for workflow development.

Proposed solution

Wrap st2flow in an electron app (and/or a docker container), and hook it up to a local git repo such that when you "save" in the UI, it does

git add . && git commit -m "foo" && git push

This way, folks can download the UI designer for StackStorm, have drag and drop capabilities for workflow creation, and have it hooked up to source control