test: add a pull request CI workflow and fix lint issues

[markgoddard]

• test: replace exportloopref linter with copyloopvar
• chore: fix issues found by golangci-lint
• test: skip integration tests when run with -short
• test: add a pull request CI workflow and basic Justfile

[gemini-code-assist]

Summary of Changes

Hello @markgoddard, 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 primarily focuses on enhancing the project's development workflow by introducing a new CI setup and addressing various linting issues. My aim was to streamline testing, improve code quality, and ensure a more robust development environment.

Highlights

• CI Workflow & Local Tooling: I've introduced a new Justfile to standardize common development tasks like running tests and linting, and laid the groundwork for a pull request CI workflow.
• Linter Configuration Update: I've updated the golangci-lint configuration to replace the deprecated exportloopref linter with copyloopvar, ensuring modern and effective loop variable analysis.
• Lint Issue Resolution: I've addressed numerous linting issues across the codebase, primarily focusing on unused return values from fmt.Fprintf and defer calls, and simplifying variable declarations.
• Integration Test Optimization: I've added logic to skip time-consuming integration tests when the Go test runner is invoked with the -short flag, improving local development iteration speed.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point in your pull request via creating an issue comment (i.e. comment on the pull request page) using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in issue comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist is currently in preview and may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments to provide feedback.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request introduces several improvements, including a new CI workflow, updates to the linting configuration by replacing exportloopref with copyloopvar, and various code changes to address linting issues. The Justfile additions provide convenient development shortcuts.

The review focuses on the lint fixes, particularly how errors from Close() methods are handled. While ignoring these errors in deferred calls satisfies linters, it's recommended to log them to aid in diagnostics, especially for client connections and file handles. Other changes, such as skipping integration tests with -short and minor code refactorings, are good improvements.