Add Docker support for Go tests with new Makefile target and Dockerfile

[Frozen]

Pull Request Overview

Adds Docker-based support for running Go tests by introducing a dedicated Dockerfile and Makefile target.

• Introduce Test.Dockerfile to set up a container environment and run make go-test.
• Add docker-go-test target in the Makefile to run tests inside the built image.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
Test.Dockerfile	New Dockerfile for installing dependencies and executing Go tests.
Makefile	New docker-go-test target to run Go tests via the Docker image.

Comments suppressed due to low confidence (1)

Makefile:261

• [nitpick] The docker-go-test target assumes the image frozen621/harmony-test is already built, but there’s no build step or documentation. Consider adding a docker-build-test target or instructions to build and tag that image.

docker-go-test: