Fix java relay host binding for CI#159
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Spark Java's ipAddress("localhost") binds to 127.0.0.1 on Linux,
making the relay unreachable from the test runner Docker container
which connects via host.docker.internal (172.17.0.1).
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Summary
build-and-run.shdefaultedSDK_RELAY_HOSTtolocalhost, which on Linux binds Spark Java to127.0.0.1onlyhost.docker.internal(resolves to172.17.0.1), causingECONNREFUSED0.0.0.0so the relay accepts connections from all interfacesEvidence
test-java-sdkfailing withconnect ECONNREFUSED 172.17.0.1:4000Listening on localhost:4000) — it's just unreachable from DockerTest plan
test-java-sdkpasses on this branch