Prevent simultaneous workflow executions with Redis

Purpose

This ensures that executions of scheduled workflows do not overlap when they take longer than expected.

This is a separate workflow which monitors the execution of the main workflow
Stores a flag in Redis (key dynamically named after workflow ID) which indicates if the main workflow is running or idle
Only calls the main workflow if the last execution has finished

Update the credentials suitable for your Redis instance
Replace the Schedule Trigger of your main workflow by an Execute Workflow Trigger
Copy the workflow ID from the URL
Paste the workflow ID in the Execute Workflow Node of this workflow
Configure the Schedule Trigger Node