oomol-lab/open-flow ? reverse-engineered prompt

Build me an open source workflow app where I can visually create automations on a canvas, run them, and clearly see what happened at each step.

I want to be able to start workflows manually, on a schedule, from webhooks, or from app events. Each step should show its inputs, outputs, logs, and any errors, and I should be able to add simple JavaScript for custom logic, branch the flow, reuse subflows, and pause for human approval when needed.

It should also connect to common apps like Gmail, Slack, GitHub, and Notion without putting credentials directly into the workflow itself. Please include a self hosted setup that runs locally with Docker, plus a web app or workbench for editing and reviewing flows. If it helps, look up current docs online for any details that are needed.