How to alias environment variables?

[guillaumebriday]

The documentation specifies that tags can be used to assign additional variables to particular hosts: https://kamal-deploy.org/docs/configuration/environment-variables/.

However, I need to use a specific name for my environment variable because the PostgreSQL container requires it—in my case, POSTGRES_PASSWORD.

I intend to deploy two PostgreSQL instances, each with a different password, while keeping the environment variable name consistent.

Below is a simplified version of my deployment configuration file:

accessories:
  db:
    image: postgres:16
    host: 192.168.0.1
    env:
      secret:
        - POSTGRES_USER
        - POSTGRES_DB
        - POSTGRES_PASSWORD

  db-replica:
    image: postgres:16
    host: 192.168.0.2
    env:
      secret:
        - POSTGRES_USER
        - POSTGRES_DB
        - POSTGRES_PASSWORD
        # I want to map REPLICA_POSTGRES_PASSWORD to `POSTGRES_PASSWORD` here
        # - REPLICA_POSTGRES_PASSWORD

Do you know if it possible?