[Bug]: dockerConfigFile property file not used

Module

Core

Testcontainers version

1.19.8

Using the latest Testcontainers version?

Yes

Host OS

Windows

Host Arch

x86

Docker version

podman

What happened?

When trying to configure authentication, it seems that the documentation is misleading:

It says:

Use DOCKER_CONFIG_FILE environment variable.
export DOCKER_CONFIG_FILE=/some/location/config.json
Use dockerConfigFile java property
java -DdockerConfigFile=/some/location/config.json

here: https://java.testcontainers.org/modules/docker_compose/#using-private-repositories-in-docker-compose

But: dockerConfigFile is not used.
and it looks like you should not use DOCKER_CONFIG_FILE, but DOCKER_AUTH_CONFIG instead.

Not having the ability to use a system property is annoyng, since it makes it diffucult to configure docker authentication with java code directly.

That's what I infer from: https://github.com/testcontainers/testcontainers-java/blob/main/core/src/main/java/org/testcontainers/utility/RegistryAuthLocator.java and from my tests.

Relevant log output

Additional Information

No response

Start with core/src/main/java/org/testcontainers/utility/RegistryAuthLocator.java and compare its configuration handling with the Docker Compose documentation at the referenced page. Determine why dockerConfigFile is not used, then verify that the documented configuration options, including Java system-property configuration, work consistently for Docker authentication.