.env.prod.local not picked up on docker compose up about symfony-docker HOT 4 OPEN

Hello @fleonardelli!

You can say to Docker Compose to use non-default .env-file by setting --env-file option or by using the env_file attribute in (one of) compose.yaml file (see https://docs.docker.com/compose/environment-variables/set-environment-variables/).

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Can you provide a reproducer pls ?

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Run: git clone https://github.com/dunglas/symfony-docker.git .

Modify the compose.prod.yaml to:

# Production environment override
services:
  php:
    env_file:
      - .env.prod.local
    build:
      context: .
      target: frankenphp_prod
    environment:
      APP_SECRET: ${APP_SECRET}
      MERCURE_PUBLISHER_JWT_KEY: ${CADDY_MERCURE_JWT_SECRET}
      MERCURE_SUBSCRIBER_JWT_KEY: ${CADDY_MERCURE_JWT_SECRET}

Add .env.prod.local:

SERVER_NAME=:80
APP_SECRET=ChangeMe
CADDY_MERCURE_JWT_SECRET=ChangeThisMercureHubJWTSecretKey

Now run: docker compose -f compose.yaml -f compose.prod.yaml up -d --wait

It will output:
WARN[0000] The "APP_SECRET" variable is not set. Defaulting to a blank string.
WARN[0000] The "CADDY_MERCURE_JWT_SECRET" variable is not set. Defaulting to a blank string.
WARN[0000] The "CADDY_MERCURE_JWT_SECRET" variable is not set. Defaulting to a blank string.
[+] Running 0/1

@maxhelias I guess it's enough. Because of that if I request the server it will always print phpinfo() output.

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@fleonardelli when you configure both env_file attribute and set the values of environment variables to be mandatory, Docker Compose will still warn about missing values for environment variables from the host, even if these values are already set in the env_file attribute file.

If there are required parameters in environment attribute, they will not be subtracted from the env_file attribute file. The values of environment variables are passed through to the container.

If you want to be able to convert environment variables (as is done in this template), then you must use the --env-file parameter or the COMPOSE_ENV_FILES environment variable when running the docker compose command.

The documentation page has a table of results when there are multiple sources for environment variable values. However, there is no example of what the result will be if both parameters are present (in attribute env_file and in attribute environment).

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