It would be great to allow locked environment variables for starters. For example, I use a configuration changing plugin on my project that requires a CONFIGURATION environment variable at runtime. I have created a Railway configuration file that properly configures the project to run on Railway.
As it currently works, my starter button defines a CONFIGURATION env var, with a default value of Railway, and a "description" of DO NOT CHANGE. It would be great to make this variable hidden/locked when a user tries to deploy with my starter button.