[Enhancement]: Support TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE to be read from ~/.testcontainers.properties about testcontainers-java

[myhau]

I would also like to use this feature. I have exactly the same use-case as @AndreasEK. Having to provide the env variable every time is very inconvenient (especially in the IDE).

By the way, it's already implemented in testcontainers-dotnet. See docker.socket.override and host.override options in this table: Custom Configuration.

Happy to implement this one if maintainers agree that it is a good idea.

[UkonnRa]

+1, I think the problem is in this piece: https://github.com/testcontainers/testcontainers-java/blob/main/core/src/main/java/org/testcontainers/DockerClientFactory.java#L164-L168

In String dockerSocketOverride = System.getenv("TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE");, it only takes env vars as consideration. Hope it will check some fields in DockerClientProviderStrategy as well, currently EnvironmentAndSystemPropertyClientProviderStrategy just ignores docker.socket.override...

I think it just a bug...