Set HOSTNAME_EXTERNAL env variable for localstack test container

Right now localstack container does not override hostname property that leads to issues with aws responses that contains url. All works when container could be reached by localhost (127.0.0.1) but fails when running in docker env with another IP address resolved.

val sqsEndpoint = localstack.getEndpointConfiguration(SQS)
val sqsClient = AmazonSQSAsyncClient.asyncBuilder().withEndpointConfiguration(sqsEndpoint)
                .withCredentials(localstack.defaultCredentialsProvider).build()
val queueUrl = sqsClient.createQueue("aQueue").queueUrl

println(sqsEndpoint.serviceEndpoint)
println(queueUrl)

This would print something like

http://127.0.0.1.nip.io:33161
http://localhost:33161/queue/aQueue

As you can see if service endpoint would be resolved to another IP it would break

Current workaround - extract host/port from serviceEndpoint info and use it in queueUrl, but as localstack can be configured to adjust host, I believe it could be done on testcontainers side

[clslrns]

I believe the fix by @CauchyPeano should be merged. Spent half of the day trying to figure out whats wrong.

[bsideup]

fixed in https://github.com/testcontainers/testcontainers-java/pull/1891