fix: Need to be able to specify different host for gRPC in TCK

[kabir]

No description provided.

[gemini-code-assist]

Code Review

This pull request refactors the host configuration in TckAgentCardProducer by introducing separate constants for the general host and the gRPC host, enabling independent configuration via environment variables. A review comment suggests that GRPC_HOST should fall back to the value of HOST instead of the hardcoded DEFAULT_HOST to ensure that the gRPC endpoint correctly follows a custom host setting when a specific gRPC host is not provided.

[gemini-code-assist]

The GRPC_HOST should fall back to the value of HOST if SUT_GRPC_HOST is not specified. Currently, it defaults to DEFAULT_HOST (localhost:9999). This means that if a user configures SUT_HOST to a custom value but leaves SUT_GRPC_HOST unset, the gRPC endpoint will incorrectly point to localhost:9999 instead of the custom host specified in SUT_HOST.

Suggested change

	private static final String GRPC_HOST = getEnvOrDefault("SUT_GRPC_HOST", DEFAULT_HOST);
	private static final String GRPC_HOST = getEnvOrDefault("SUT_GRPC_HOST", HOST);

[kabir]

@gemini-code-assist updated, does it look better now?

[gemini-code-assist]

Yes, that looks correct. By using HOST as the default for GRPC_HOST, you ensure that if SUT_GRPC_HOST is not explicitly set, it will inherit the value from SUT_HOST (or the default localhost:9999 if neither is set), which is the expected behavior.