Hi fellows n8n users 
I’m sharing a custom node called n8n-nodes-environment-variables that I built it for my own workflows and have been using it internally for a while.
It lets you define multiple environments in one node and outputs the variables for the selected environment, so switching between dev, staging, and prod is simple.
It also supports an override for manual runs, so you can quickly test against a different environment.
Repo and install info: https://github.com/romainminaud/n8n-nodes-environment-variables
I built something similar for managing multi env credentials, let me know if this is of interest!
Romain