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currently you can only add 1 instance of an addon, like redis, and it will set the environment variables like REDIS_URL, REDIS_PORT etc.
in heroku for example, you can add 1 instance of an addon and it work the same way railway does now, but you can add more instances of the addon and it will set the environment variables like
instance 1:
REDIS_URL_BLUE
REDIS_PORT_BLUE
etc
instance 2:
REDIS_URL_RED
REDIS_PORT_RED
etc