I'm trying to use an environment variable like so:

store Api {
  state endpoint = @ENDPOINT
  [...]
}

When I run the mint dev server, it's saying:

ERROR (ENV_NOT_FOUND_VARIABLE) ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░

I cannot find the environment variable with the name:

  ENDPOINT

I've tried running the dev server like so:

$ mint start --env ../.env.dev
# or:
$ ENDPOINT=localhost:3000 mint start

My .env.dev file contains the text ENDPOINT=localhost:3000 followed by a newline)

If I rename the file (cp ../.env.dev .env) then the server does not give me the same error. I suspect the logic to read environment variables from the actual process environment, or from a specified env file, is not working.