Refactor testserver to use the testing pkg

[rthellend]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @rthellend, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly refactors the project's testserver component by converting it into a standard Go test suite. This change moves the server's functionality from a standalone executable to a test-driven approach, allowing it to benefit from Go's robust testing package for improved logging, error management, temporary resource handling, and overall test organization. The associated build and deployment scripts have been updated to reflect this new testing paradigm.

Highlights

• Refactor to Go Testing Package: The testserver application has been refactored from a standalone main package into a _test package (main_test.go), allowing it to leverage Go's built-in testing framework.
• Enhanced Test Utilities: All logging and error handling within the testserver now utilize *testing.T methods (e.g., t.Logf, t.Fatalf, t.TempDir(), t.Context()), providing better integration with Go's testing ecosystem.
• Updated Build and Execution: The build scripts and Docker Compose configuration have been updated to compile the testserver as a test executable using go test -c and pass standard testing flags like --test.v and --test.failfast.

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[gemini-code-assist]

Code Review

This pull request is a great improvement, refactoring the test server from a standalone executable into a proper Go test using the testing package. The use of TestMain, t.TempDir, and t.Context is idiomatic and makes the test suite more robust. My review focuses on improving error handling within goroutines to ensure that test failures are reported clearly and promptly, by using the appropriate functions from the testing package like t.Errorf instead of t.Logf or t.Fatalf in concurrent code.