Fix kafka internal docker connection

[catinapoke]

What does this PR do?

I fixed passing alias name in startup script when it's possible.

Why is it important?

You can't connect to kafka container from other container at the same docker network.
Details: https://www.confluent.io/blog/kafka-listeners-explained/

Related issues

I have stumbled into issue with connecting from app docker container to kafka docker container at the same network. I tried many options including altering KAFKA_ADVERTISED_LISTENERS, but none of them worked. Finally, I found out that you overwrite KAFKA_ADVERTISED_LISTENERS in startup script.

Options I tried:

1. Alter KAFKA_ADVERTISED_LISTENERS
2. Change network type from bridge to host (it's impossible)
3. Add new listeners

How to test this PR

I have tested it in my ProofOfConcept repo https://github.com/catinapoke/testcontainers-poc in kafka_test.go file
You can run it go test -v ./tests/integration/kafka_test.go

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[catinapoke]

@mdelapenya hi, will you make code review?

[mdelapenya]

@eddumelendez wdyt about this one? It LGTM from the code point of view, but want to double check with you if you see anything else 🙏

[eddumelendez]

Hi, I think the approach should be consistent between Redpanda and Kafka regarding adding additional listeners https://golang.testcontainers.org/modules/redpanda/#additional-listener

[catinapoke]

Okay, I will check this

[mdelapenya]

I think that, after #1989, we can close this one. @catinapoke could you double check it? 🙏

[mdelapenya]

BTW I'm going to add support for registering listeners, like in the redpanda implementation.

[catinapoke]

I think that, after #1989, we can close this one. @catinapoke could you double check it? 🙏

I checked and it is doing different things, so not yet

[mdelapenya]

The code to register listeners will shadow what the redpanda module is currently doing (see https://github.com/testcontainers/testcontainers-go/blob/main/modules/redpanda/redpanda.go#L295), but instead of using the YAML template to render the listeners, we are going to build the proper environment variables for kafka: KAFKA_ADVERTISED_LISTENERS, KAFKA_LISTENERS, etc